"So, to our credit, we invented religion"
You assume that man "invented religion" and did not recieve it (Christianity to be specific) by revelation from God. If Man "invented" Christianity then it has no meaning whatsover except as an opiate of the masses as put by Marx.
I believe that Man "invented" Athiesm as a, now subconcious, means to skip out on his responsibility to God. This allows Man to think he can sin endlessly without consequence. What a great deal...eh? NOT!
So, to our credit, we invented religion"
No, to mans credit he has invented millions of religions each proclaiming that it is the real truth.