If we took a whole generation of kids and shielded them from any contact with any religion, but gave them the Harry Potter books and said these books were the word of the almighty, obviously we would all agree that those kids would grow up worshiping Harry Potter. Let's pretend then this occurs for about 30 years. Then we explain to them that it was a story written by J.K. Rowling. We show them a picture (presumably she'd be dead by then). Do you think they would immediately abandon their beliefs? Even as us, the ones with knowledge, knew for a fact that Harry Potter was not in fact god, would these kids just accept what we said? Of course not. The point of this is to show that religion is based on what people are told, not what is true.
And how do you know this for a FACT?
You dont, so stop talking s##t