Why is it immature to see people preach one way, behave a separate way, and conclude they're full of shit? It seems a basic requirement of a reasonable human being that people preaching that folks should behave way X comport themselves in way X.
eg the catholic church is, at this point, practically a child rape conspiracy: over and over people in the church discovered what was going on, and over and over they chose to tolerate the behavior to protect the church. Just to pick one notable example, the pope chose not to defrock a priest that molested TWO HUNDRED boys in his care [1], instead squirreling him off to northern wisconsin... where he had more access to children. As their book says, you shall know them by their fruits. This was an act performed by the head of the catholic church.
If you can stomach the acts performed by the church and the totality of the church hierarchy, then still believe what they preach, I'd say you're practically deluded.
[1] http://scienceblogs.com/dispatches/2010/03/26/wisconsin-prie...