Scripture dating non believers
The most important piece of advice is that saying he knows Christ doesn't mean he has a relationship with Him.
Marriage based on a common faith is for our benefit, blessing and protection. Make the decision to follow Him and allow Him to help you find the right mate for you.
According to the scriptures, relationships are very important, and faith does matter.
After all, faith lays the foundation for your world-views, and world-views will control how you see and respond to the world, and that includes relationships.
Paul goes on to remind believers that they are the dwelling place of the Holy Spirit, who inhabits their hearts at salvation (2 Corinthians -17).
Because of that, they are to be separate from the world—in the world, but not of the world—and nowhere is that more important than in life’s most intimate relationship—marriage.
And because the Bible doesn't specifically warn against a non-believer (more on this later), you’re OK in regard to a sinful behavior that needs to be avoided. Now, I’m not saying this because inherent in her unbelief is some immoral compass that will lead you down a path of sin and debauchery. As a Christian, your life is built on a desire to trust and follow Jesus to the ends of the earth.
For her, well, I don’t know what her foundation is—and maybe she doesn’t either.
In 2 Corinthians , the Apostle Paul says that believers should not "be unequally yoked with non-believers." While it's true that this passage does not specifically mention marriage, it does refer to being bound in a relationship with another person—no relationship is more binding than marriage.
The picture of two oxen bound (or yoked) together is often used to explain this Scripture. Otherwise, they will fight with one another and experience exhaustion.
The same is true of two people who marry but don't share a common faith.
Instead of working together to pull the load, they would be working against each other.
While this passage does not specifically mention marriage, it definitely has implications for marriage.