Yeah. That's what I was thinking of. Every generation grows up being told they're a disappointment for not being God, but perpetually believes that their own children could be God so they can be redeemed through being a sort of "Mother Mary" figure.I think this is a fascinating idea. Personally, I'd make it not so much that children are sacred, but some future children, always a generation away from arriving and ushering in the age of these "new true gods." In that way, you can add some of the contradiction and paradox common to religious mysteries. The actual children born are considered "disappointments" by some sects and by others a generation that must adhere to these beliefs and work harder to make sure the generation they produce achieves this future.
Whether or not their version of a Messiah actually comes would be uncertain in the setting. The point would be that they believe they're coming and are trying to do everything they can to make that happen.