A long time personal mantra of mine is "never trust anyone with a 'Jesus fish' or a cross on their business card." People who feel the need to advertise how religious they are are often the least trustworthy, in my experience.
Also, churches are often horrible clients. Years ago, I did consulting work and dealt with lots of churches. Most of them were really shitty and don't like to pay their bills. We had exactly two churches, out of probably dozens, that were good clients.
I'm a Christian and this is been my experience so I totally get why some people feel like the church, as a whole, is shit. A lot of times it's a well deserved reputation unfortunately.