It's a much, much bigger jump to go from believing in a creator to believing in a God (or Gods) who rewards and punishes humans on a one-by-one basis, and even a bigger jump to the paradox and schism packed belief system that is Christianity.
True....but societies with great numbers have never ever been capable of great freedom, creativity and productiveness and fairness under any paradigm but the Christian one. No other gives dignity and worth to every single human being.
That being said.....why destroy the Christian ethic when no other ideology gives such freedom and fairness? None. Atheism ends in totalitarianism and destruction of freedom and morality. Evil always gets rewarded and goodness gets punished and taxed (and eliminated).
Objective Truth is necessary for Just Law. You can never have it in a moral relativist society (one with no Revelation and Objective Truth) which are all cultures and religions not based on Natural Law Theory (like Christianity) and the basis of the US Constitution. The Christian paradigm dominated America and was the reason underlying the success of the Capitalistic country. Morality has to be a part of Capitalism.
Socialism destroys freedom and responsibility and T. Dalrymple explains the destruction of cultures which destroys the family and Christianity. Welfare state always destroys the family and faith.