Reinforced conformity gene
What I meant by gene inheritance was more to do with a gene that may gives a tendancy towards conforming with your parental belief, being reinforced because those who fail to conform would be ostracized from the group and therefore have less chance for having children. So only those with a tendancy to conform would mate. (this is effect may be being slightly diluted by the easy of travel and communication)
This would give a self reinforcing loop that made religious followers have more children and pass on a gene for conformity along with an idea to conform to and the idea is their religion (no specifically one religion)
As you say the early religions were inclusive and tended to mix when they met but a you would still be ostracized if you didn't conform to your local belief system. Once the monotheism predator religions started to eat the other religions. (christianity steals from more then just Judaism, but also Isis, mithras and bits and pieces of a great number of other pagans gods) The battle of which god to follow truly took off, and accelerated the evolution of religion.
If you look at christianity and Islam now, they are both vastly different from how they were even 100 years ago. But the gene for following religions (or conformity) is still passed on along with an idea to conform to.
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