That every culture has come up with their own religion and deities does demonstrate that gods are human inventions, no different than Santa Claus and the boogey man – fictional characters meant to stand as enforcement of behaviour by providing a reward/punishment that is beyond the scope of the parents – who can only reward and punish behaviors that they become aware of; while Santa, boogey man, god and all other supernatural creatures are constantly aware and vigilant.
That all cultures have invented gods and religion, speaks to how effective a means that religion is to control thought and behaviour. Especially evidenced by how believers become active participants in the control mechanism by embracing it and touting it as true – despite the utter lack of evidence.
Religion is the ultimate conspiracy theory, in which the lack of evidence for is claimed as evidence of and the idea is against not only all evidence, but also logic, history and reason.
And like conspiracy theories, facts, evidence and reality to the contrary of the pet theory, does not dissuade believers – it only reinforces their confirmation bias as believing contrary to evidence, is what faith essentially is.