I would say that those people who claim that they do know that there is a God have found this claim of theirs the most wonderful excuse for behaving extremely badly. So belief in a God does not seem to me to result automatically in behaving very well.
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When you look at organised religion of whatever sort — whether it’s Christianity in all its variants, or whether it’s Islam or some forms of extreme Hinduism — wherever you see organised religion and priesthoods and power, you see cruelty and tyranny and repression. It’s almost a universal law.