That depends upon the people in the relationship, how high of a priority their religion is, and the measure of how different they are. If you are different denominations, within the same religion, that would be possibly easier. I've heard of stories from friends where families become very upset and sometimes "disassociate" from the couple if they change denominations or marry outside of their denomination. Then again, I also had a friend who was Roman Catholic but her husband was Baptist. Neither condemned the other - they attended her church for early service and his for 11 a.m. worship. They were loving, happy and all was well. The most important thing is this: If you are a Christian who believes that Jesus is your Lord and Savior, then you are a Christian FIRST and being a Baptist, Methodist or whatever should be important only in getting Biblically correct education and leadership about the Bible. Christians are all one family, brothers and sisters in Christ. If you are of a different religion altogether, you may need to seek counsel from leadership in your place of worship for guidance.