But there is no doubt that it is wrong. Completely, totally wrong. To this audience I can say, as wrong as theism.

I did not really see this being backed up, certainly not to a "wrong as theism" level. Much more importantly, it being wrong has little to do with you being right, any more than if Darwinian evolution is wrong, there must be an all-powerful father figure who cares deeply about what you do in the bedroom and if you eat meat on Fridays.