When Joshua gives his farewell address to Israel he warns them about marrying those who worship other gods. That same principle is found in 2 Corinthians 6, we're told not to be unequally yoked with an unbeliever. We're not to marry an unbeliever. Why? Because it will hurt our walk with the Lord. I see it happen all the time as young, godly women who love Jesus with all their heart fall in love with somebody who doesn't love Jesus and ultimately make the decision to marry them. Suddenly they have become yoked with an unbeliever and there's divided spiritual loyalty in the home and marriage.
If you're a single woman listening right now may I give you some pastoral advice? One of the worst mistakes you can make is to marry someone who doesn't love Jesus. The problem is that it is very possible to fall in love with someone who doesn't know Jesus. My advice to you is this, if you want to ensure that you never marry someone who doesn't love Jesus, then you need to be sure you don't fall in love with someone who doesn't love Jesus. And the way you ensure that you don't fall in love with someone who doesn't love Jesus is very simple. Don't ever date someone who doesn't love Jesus.