I know people should not get dressing if they can't accept each other as they are. Going back in time, it was never encouraged pron people to marry cross their faith and this covered most christian religions in the United States.
My beliefs have changed several times in my life, but not those things, so my interfaith marriage has lasted 25 years.
To me, the core question is, is this person inclined toward self transcendence are the inclined, desirous, self aware enough to be selfless. Forget what anyone else says or expects of you.