Can a home wrecker be a Christian?

Woman A is a “devout Christian” but is sleeping with a ‘man’ who is married. His wife is 8 months pregnant with a baby they spent 9 years trying to create. She convinced him to leave his wife for her, yet claims to be a Christian. I’m curious if you believe a woman can be a Christian while simultaneously fucking a married man and destroying a family.

I’d just like to note: the man is not innocent. He’s selfish AF too. But this woman worked like a snake, saw some stress between the couple and wiggled her way in at a very opportune time.