As a christian I already have a region that is not debatable. That helps me be more willing to debate all the things outside. Communist, capitalist, jew, muslim, hindu, cannibal, republican, democrat, green, other sect of christian - all the same to me, something I'm not religiously attached to so I can try to understand. Some of those I understand enough to conclude they are wrong.
I know some who are strongly religious about their political party. I was treasurer of my local Republican party for a while, but I was able to leave them when the party it self starting going off of the things I supported them for (the local party is still pretty good). I might return in the future, we will see.