I don't hide that I'm Christian, but I can tell you what kept me from Christianity to begin with were the foaming idiots finding a stump to stand on to tell me how I was going to hell.
When I was in college there was a local preacher who would come to the campus and entertain some of the students between classes. He stood in a corner of a quad area outside and preached. I was a Christian and listened to him for a little while. I wasn't entertained at all. I could tell most of the students were amused by him even though he didn't realize it. I talked to some of my non-Christian dorm mates afterward. They thought he was a joke. I was trying to dispel the negative image they had of Christianity. This clown set me back quite a bit.