12 Step Programs like “AA” and rehabilitation centers do not boast high success rates. I don’t expect them to. By the same token, I don’t expect the superstitious to cease and desist from attending their church mass every Sunday, and gazing up at the ceiling while mumbling incoherent gibberish to an omnibenevolent “god” who is is perfectly “righteous”, but not QUITE “righteous enough” to bother to prove himself objectively.
To suggest that man cannot be good without God(s) is to admit that they are not in fact moral, but simply fearful. There is a difference between honest morality and simple obedience to avoid punishment, or in hope of reward, and only without faith is this distinction always clear.