I think he tried to make a witty remark about when will the United States perform an "Evolution to a freer, more democratic, more generous country"? (because they don't accept the theory of evolution.. get it?)
I conclude that the OP has the opinion that the united states lack, to a certain degree, those qualities due to their underlined racism (for perceiving "Man"(..kind?) as white people) and intolerance towards other beliefs such as the theory of evolution by utterly rejecting it.
I might be wrong as the OP blurred the transition from "United States Christianity" to the whole country.