I'd say go for it, though with the added point that if they're not open to tolerant discussion about their beliefs then that might be a problem. I don't think just agreeing to not talk about differing religious opinions is the way forward anymore than having to be of the same opinion. You should be able to discuss such things with a feelings of mutual respect.
"It is not as a child that I believe and confess Jesus Christ. My hosanna is born of a furnace of doubt." ~ Fyodor Dostoyevsky