Hi, Juan —

Thank you for your question.

Unfortunately, there was a line of Borgia and Medici Popes that were horrible. This was the manure that fertilized the ground for the Protestant Reformation, or rather revolt. I'm not sure of all the details, but there were also several bad Popes in the Middle Ages. Some sold Cardinalships to fund armies. It was not pretty.

Nevertheless, none of these Popes ever taught anything new.

Christ promised that he would protect His Church and the Pope from officially teaching error. (Matthew 16:13-19, 1 Timothy 3:15)

He did not guarantee the Church would be never be ruled by corrupt men, so regardless of these men and their lack of personal holiness, the Church is still True.

If anything, this is a witness that the Holy Spirit is at work, keeping the Church doctrinally pure. No other institution would have survived this kind of internal corruption for such prolonged periods.

I hope this helps,

Under His Mercy,

John DiMascio