That's not quite what you said. First you said religion is eugenic b/c it strengthens society and gives meaning to reproduction and this is why religion persists. Now you're saying we were created religious because religion is eugenic. Those are not the same statement.
Regardless, I am saying that you have the cart before the horse. We are inherently religious. We were created to worship, full stop.
You claim that meaningful reproduction is eugenic. How do you know? You imply that eugenic reproduction is good for society...again, that's a big claim.
So like I said, too many claims at once. Cool shower thought, but needs some refining.