I am not terribly interested in Christianity, per se. I am interested in what a person believes, though. I know religion isn't discussed in polite company, but I'm seldom accused of being polite...
Its just a topic that comes up. I like to listen to people talk about their beliefs. I don't so much concern myself with "Joe Blow is teaching me about the Christian religion", its more like "Joe Blow is telling me more about what he believes". Sometimes an acquaintance has Christian beliefs, sometimes its another religions, sometimes its just an eclectic collection of thoughts. I'm happy to hear them all.
I just like to understand a person.
Oh I get that. All depends on how deep you want to go. I have friends at temple, who I've learned not to discuss Hinduism with. Their view is slightly different that mine, and it ends in some senseless argument. One learns to pick their battles.