Nowadays, a religion dogma can serve in a way you described. But at the beginning of the dogma it was a dead serious matter. A precious truth. Still, it received a little respect in far away tribes, for they have some different spaghetti monster mythologia and you would be doomed there with your native tribe's tales.

So, you are right here. Therefore, one can best stayed at home. Except during a war, when he can spreads some genes across, if he was very lucky.