This question was prompted by something Cassa333 said. All religions claim they are right and the others wrong. If you have a religion, are you sure it's the one God recognises - and if so, why?
OG, if the believers were as sure as you that God would recognise them all, they would need only one religion and they wouldn't be fighting each other.
I suspect that is not so. Were religion simply about spirituality then ok, but surely there are reputations and authority and all sorts of corporeal reasons to oppose the others who are clearly doing it all wrong.