Told you so!
I realized recently (probably fairly late to the game), that there is a simple refutation to all religious beliefs. It can not be contradicted by any honest person. There are only two possible responses: Think about it honestly, or choose to ignore the truth.
Here it is:
Anyone who believes in any gods does so for no other reason than somebody else telling them to. If their religion has a holy book, they only believe the book to have authority because someone told them it does.
That’s it — plain and simple.

