I don't care what people do with religion, unless it's used just to annoy/hate another group (see: Westboro). However, the real reason I'm agnostic is because some people use their religion for total ignorance. Not everyone, though. Quakers are the most peaceful religion by far, but guess what? Christians burned them to death as "witches" and "warlocks". Oh religion
I'm still not saying all religions are bad. I know very nice Christians who don't ignore real facts and don't rub their beliefs in other's faces. I like that kind of people.