[Theaetetus]

Many people are conditioned to think that God is necessary to be moral, but it doesn't work that way. Children could be raised just as easily to think the boogeyman will haunt and torture them for being immoral. God is convenient for the powers that be because it is easy to tag God with behavior he doesn't like and will send you to hell for.

Personally, guilt and shame tend to uphold my morality. I feel guilty for immoral behavior and if others catch me I feel shameful. Emotions do wonders when people are raised to understand what they are trying to teach.