LH

Hitler, Pol Pot, etc were truly irreligious, I agree. However, these regimes uniformly denied or twisted reason and scientific fact in an effort to support a delusional philosophy that included racist and anti-intellectual practices. Their successes were due to yet another blind acceptance of unreasoning dogma, of unjustified belief. The Third Reich blended real science with a twisted secular mythology, and like a dangerous religion, required the same suspension of rationality. Only critical and reasonable thinking can combat the madness inherent in a Third Reich OR a dogmatic religion.
As for "the present mythology of an ever-expanding profit economy being a good thing for the World", I don't see anything essentially bad about profit. When profit becomes an end in itself, committing masses of people to ignorance and virtual slavery, then it is wrong. These abusive activities are a product of greed, and the process is rational and understandable, even if wrong. Reasonable solutions can be applied to correct it.
There are many wrongs in the world, and certainly not all of them are the result of people blindly following an irrational religious credo. But there are few other stimuli that will cause a person to take his own life, kill his daughters, initiate a nuclear war, or decapitate an innocent nurse in front of a camera, besides the psychotic belief that he is doing God's will. Nationalism won't do it. Neither will the desire to make an obscene profit.