Monique,
It depends on whether they obtained a disparity of
cult dispensation when they got married.
Catholics need to get married in the Church (meaning either have a Catholic ceremony or get permission — or a dispensation — from the Church to get another kind of ceremony).
If this is not done, whether the putative spouse is Christian or not, they are not considered validly married, so their sexual congress is tantamount to fornication, which is a grave sin.
If they knowingly and deliberately are doing this, they are in a state of mortal sin, and you can't receive Holy Communion in a state of mortal sin.
Eric
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