Not to repeat what's alreay been said here, but organized religion is not necessarily a bad thing.

As with any system without checks and balances, the ones on top tend to get corrupt. The same is true with religion; over the years the 'leader' or influential figure in the religion abused the power he had over others. (This happened in pretty much every religion, so I won't go into details).

Beyond that, I see no problem in people actively participating in an organized religion. Personally, I don't, but that's just my opinion.

Again, you need to draw the distinction between believing in god and participating in organized religion. They are very different.