| Dear Yahkanon, While revered by the Mandaeans as
                                                                                a Mandaean, John the Baptist was,
                                                                                according to our Scriptures, a Jew
                                                                                with no hint of any other teaching.
                                                                                As my colleague ably pointed out,
                                                                                John was descended from Israelites,
                                                                                the son of a Jewish priest, and recognized
                                                                                as Jewish by Jesus Himself. Mandaeans,
                                                                                who refer to John as their last prophet,
                                                                                surmise that they may be descended
                                                                                from followers of John the Baptist
                                                                                who fled eastward from the Jordan
                                                                                valley and ultimately settled along
                                                                                the lower reaches of the Tigris,
                                                                                Euphrates, and Karun Rivers. There
                                                                                is nothing incompatible with Christianity
                                                                                in this claim. As for whether John the Baptist was
                                                                                a Jew, let's look at Luke 1:5-9: 
                                                                                5 In the time of Herod king of
                                                                                     Judea there was a priest named Zechariah,
                                                                                     who belonged to the priestly division
                                                                                     of Abijah; his wife Elizabeth was
                                                                                     also a descendant of Aaron. 6 Both
                                                                                     of them were upright in the sight
                                                                                     of God, observing all the Lord's
                                                                                     commandments and regulations blamelessly. 7 But  they had no children, because
                                                                                     Elizabeth was barren; and they were
                                                                                     both well along in years. 8  Once when
                                                                                     Zechariah's division was on duty
                                                                                     and he was serving as priest before
                                                                                     God, he was chosen by lot, 9 according
                                                                                     to the custom of the priesthood,
                                                                                     to go into the temple of the Lord
                                                                                     and burn incense."Luke 1:5-9 
                                                                                 Zechariah was a priest, a descendant
                                                                                     of Aaron. This made him ethnically
                                                                                     a Jewish priest, since Aaron was
                                                                                     the brother of Moses, the founder
                                                                                     of the Jewish people, and Jewish
                                                                                     priesthood was defined in terms
                                                                                     of one's being a descendant of
                                                                                     Aaron (Exodus 28:4). (I am using Jew in
                                                                                     the Merriam-Webster Unabridged
                                                                                     recognized sense of Israelite, a member of the Hebrew people.)
 
 
 Zechariah served in the
                                                                                     temple of the Lord. There
                                                                                     was only one temple of the
                                                                                     Lord, and that was the temple
                                                                                     the Jews worshiped at. While non-Jews
                                                                                     admittedly did worship at the
                                                                                     temple, they would not have served
                                                                                     as priests there. So we've established that Zechariah
                                                                                was a Jew, in the broad sense of
                                                                                being a Hebrew and following the
                                                                                Jewish faith. Luke 1 Verses 16-17 says of
                                                                                John the Baptist,  
                                                                                "Many of the
                                                                                     people of Israel will he bring back
                                                                                     to the Lord their God. And he will
                                                                                     go on before the Lord, in the spirit
                                                                                     and power of Elijah, to turn the
                                                                                     hearts of the fathers to their children
                                                                                     and the disobedient to the wisdom
                                                                                     of the righteous—to make ready
                                                                                     a people prepared for the Lord." Luke 1:16-17 So here John the Baptist was 
                                                                                 sent to minister to and convert the
                                                                                     Jews (Israelites);  in the power
                                                                                     of Elijah (a Jewish prophet);  to make ready a people prepared for
                                                                                     the Lord (the Jewish Messiah).  He
                                                                                     was circumcised on the eighth day
                                                                                     (Luke 1:59) according to the Jewish custom
                                                                                     that confirms the Jewish covenant
                                                                                     (Genesis 17:12). Zechariah specifically
                                                                                     refers to the "God of Israel" (verse 68),
                                                                                     along with Abraham (verse 73), the father
                                                                                     of the Jews. John the Baptist "lived
                                                                                     in the desert until he appeared publicly
                                                                                     to Israel" (verse 80).  I don't know how much more Israelite
                                                                                (Jewish) you can get. It was a Jewish
                                                                                tradition. There were ceremonial
                                                                                washings, to be sure, in the Old
                                                                                Testament (Exodus 29:4, Leviticus
                                                                                14:8-9, Leviticus 15:5-13, Leviticus
                                                                                15:21-27, Leviticus 16:26, etc.)
                                                                                Baptism probably developed from these
                                                                                washings. In any case, it's a jump
                                                                                based on this evidence to go from:  
                                                                                John
                                                                                     baptized which was not attested to
                                                                                     as such in the Old Testament to  
                                                                                John
                                                                                     the Baptist was a Mandaean. Both
                                                                                Christianity and Mandaeism acknowledge
                                                                                that baptism rites existed before
                                                                                John the Baptist. As Christians believe,
                                                                                Mandaeism believes that baptism is
                                                                                a purification rite.  Perhaps this
                                                                                is one of what Pope John Paul II, who showed respect to Mandaeism
                                                                                and met with its leaders, called, the
                                                                                many points of contact between [Mandaeism]
                                                                                and the Christian faith.
 Ultimately much of this depends on
                                                                                which testimony you believe: the
                                                                                Mandaean testimony or the Christian
                                                                                testimony. There is not a lot of
                                                                                third-party evidence to confirm either
                                                                                view. My colleagues may want to consult
                                                                                the following:  for
                                                                                information on Mandaeism. Eric |