What would happen to religion if 100 years of people did not promote it?

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Basically, what would happen if all the world did not know of religion? Would we make up religions to find something to worship or would more people hear from THEE god again? Which religion survives?

Definition of religion:
The belief in and worship of a superhuman controlling power, especially a personal God or gods.
What would happen to religion if 100 years of people did not promote it?
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