It is easy to see that many religious promise a virtuous existence, either in this life or "the next".

Where is their biggest failing? What is it about most organized religions that makes them so inefficient?

I'll give my opinion on this if someone asks, but for now I want to hear other people's.

edit: I should probably make myself more clear... They offer that hope, but often fail to deliver it. Why? This may be not be the fault of the teachings themselves, but what people do with them.

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