Hmm, as much as I enjoy Dostoevsky's talent as a writer, I think this statement is plain wrong. Atheism, at least in the modern sense, the Dawkins way, does not mean to replace religion, nor to save humanity.
As I understand it, modern day educated and thinking atheists just want scientific explanations and proof on all natural phenomenons. For people like this, saying "god Jahwe/Allah/Odin did it, no need to research further!" is just not enough. There is dire need for evidence of the god that has done it, that's all.
There is no moral high ground no one claims atheism is more moral in itself (although no people were killed for disagreeing that gods do not exist), nor a need to save humanity. There is nothing to be saved from.
There is just this basic human curiosity and search of a better life that pushed our ancestors from Africa and into the entire planet.