It has been my experience in organized religion, that extremely few have the same catechism. In rare cases where people agree down to the details, it is rarely by logical process... it is emotional agreement form some sort of need to agree.

edit: I realized my message was unclear. What I mean is, people disagree, or hold a nonbelief, on many of the catechisms presented by most religions- but just dont talk about it because the desire of community.