Well, personally I think 'reason' is somewhat of an incorrect term, because religion is largely founded on irrationality and belief, not reason. I'm not saying there's anything wrong with that, your business is your business.
Anyway, I'm an atheist and my family is extremely Catholic. Unlike them, however, I have actually read parts of the Bible and I use those for the sake of discussion. It amazes me that some Christians just accept whatever a priest tells them and never actually read the book that their faith is founded on. Anyway, here's a discussion that I had between me and my dad awhile back:
Dad: The problem is Blind Sight, that if you don't believe in a higher power you don't believe in anything at all. (yes he actually said that)
Me: Completely invalid argument. It's 'I think, therefore I am' not 'I believe, therefore I am' removing your reason and logic just so you can believe in some abstract concepts is not the correct way to follow something. You have to analyze it, study alternatives, and determine truth from that. Even your own opinions conflict with Biblical teachings.
Dad: What do you mean?
Me: I know you give a lot of money to anti-abortion charities, right? So you believe that in any situation, killing 'babies' is wrong, correct?
Dad: Yes of course.
Me: Then how do you defend God for drowning babies in the great Flood? Or killing all the first born babies in Egypt when Pharaoh refused to let the Jews go? Or burning them alive when God destroyed Sodom and Gommorrah? These are all events where God willingly kills innocent children within the Bible, does he get to avoid this rule just because he's God? At best, that makes God a bully, and at worse a tyrant.
Dad: The Bible doesn't say that.
Me: Look it up, it does. It also has God tell Moses to commit genocide against the Canaanites. He orders the Jews to kill every man, married woman, child and even animals. The only Canaanites he deems worthy to live are virgin girls, and he only does this because he orders the Jews to take them as wives. Basically, making them war trophies and rape victims. Now tell me, do those actions seem like one of a higher being, or do they instead sound like the fantasies of some ordinary guy from early in human history writing a story?
My dad then told me those parts weren't in the Bible and I was 'mocking his faith'. I told him to actually read the bloody thing before he tries to tell what is and isn't in it. So far, he hasn't cracked it open yet.