When I was a kid I decided to try going to on of those non-denominational youth groups.
It was okay, but I was never very good at it.
When I told one of the "leaders" that I was going to go back to the Catholic church school for the next year because it was "confirmation" year he told me that Catholics and confirmation was not "christian".
I never viewed organized religion the same after that.
There was too much "us vs. them".
Religion is ruined by the people most times.
I completely agree with you about the "us vs. them" attitude. All too often we want to focus on our minor differences.
