If you're in a relationship that shares different views on relegion and politics, it's usually REALLY bad to get into a conversation about it. xD I can't really give you first-hand advice, because my girlfriend and I aren't relegious or political people, so we don't really have discussions about it.
In my opinion, if you both feel totally different on the subject, then you shouldn't be planning a future together or anything like that. I know that could sound very horrible, maybe one of the worst things you could think about right now. But sadly, unless you two can come to an agreement, the relationship won't work out.