I absolutely do think that mankind invented gods. How else can one explain the vast variety of theistic and mystic ideas mankind has generated through the ages? Manking imagined Santa Claus, Leprechuans, Smurfs, and Gods; there is no reason to believe that any of them really exist.
I also take issue with this:
Fifth, science is the ultimate provider both for knowledge and morals.
Science is in no way the "ultimate provider" of morals, they are a social construct and a product of evolution. I think this statement reveals the writer's bias.
However, Phat, my compliments for saying that you believe these things as opposed to saying that your belief constitutes proof.