...didn't you use them?"? Speaking as an agnostic, theists have tried to bully me into acceptance of their faith (be it christianity or islam), with scary stories of the unknown ie. the after-death.
What if one the first questions is: "Why did you listen to all that BS?"
messengers doing? History teaches and shows that polytheism comes first and then mankind may develop monotheism, never the other way round.
Historians have shown, primitive societies have gods for many things like wind or rain and monotheistic religions replaced those many gods with saints or...