It's not made clear if they were married prior to being saved, so we can only speculate. 1 Corinthians 7:12-16 has some good advice for a husband married to a non-believing wife and vice versa. This is in the ESV translation, by the way:
"To the rest I say (I, not the Lord) that if any brother has a wife who is an unbeliever, and she consents to live with him, he should not divorce her. If any woman has a husband who is an unbeliever, and he consents to live with her, she should not divorce him. For the unbelieving husband is made holy because of his wife, and the unbelieving wife is made holy because of her husband. Otherwise your children would be unclean, but as it is, they are holy. But if the unbelieving partner separates, let it be so. In such cases the brother or sister is not enslaved. God has called you to peace. For how do you know, wife, whether you will save your husband? Or how do you know, husband, whether you will save your wife?"
Incidentally, when I got married to my wife, I was an atheist, while my wife was a believer. I have since converted to Christianity, but the conversion came about from my belief in Jesus as Lord and Savior, and not because of my wife - at least not directly, anyways. My wife did get me to go to church for an Easter play, but the Holy Spirit did His work on me after that.