"Morality has an evolutionary backing"
You mean the morality in which lion kills it's cubs or wherein pigs commit incest on a normal basis. It's not the case that a materialist or an atheist is not a moral person the claim is that they cannot justify their moral standards. Since you mentioned Dawkins, in his own words "The universe we observe has precisely the properties we should expect if there is at bottom, no design, no purpose, no evil, no good nothing but blind pitiless indifference"