My husband is very much atheist, he believes in science, and my my boyfriend is Catholic (although he doesn't attend church regularly). I was raised in a staunch, Southern Baptist household, but I now consider myself agnostic. I don't believe that there isn't a god, I just don't think I'm capable of defining him/her/it.
We haven't had any major disagreements, except in the beginning of my relationship with my husband I was still christian (but unsure about it) and he used to say some hurtful things until we talked about it. We're more respectful of each other's beliefs now.
Bisexual, Hinge of a Vee with a mono boyfriend and poly husband.