My intuitive feeling is that religion (yes I'm mainly reffering to the Abrahamic religions here) is mostly a collection of outdated politics. So if you take the politics which have become tradition in religion out of it, there wouldn't be much left other than basically prayer and fasting. Which I would see as a pretty skeletal form of religion. For example the Jews have 613 commandments or something. Can you imagine them tossing all that out in favour of simply prayer and fasting? I can't.