I think the question is problematic. You see athiests can always point to scripture and claim a higher morality than God has because God ordered the killing of babies in the OT. To judge morality is based upon judging on morality that we think is moral. God judges by righteousness. God demands obedience and holiness. Not morality. Now we can say that some of God's commands have some moral components to them, but others have nothing to do with morality but have to do with righteous obedience. The word morality is not a scriptural word nor a scriptural concept. Sinfulness is a scriptural concept, righteousness is a scriptural concept, repentance is a scriptural concept, but morality is not, because man often defines morality according to his thoughts and not God's thoughts. Some claim it is not moral that man should suffer the fires of hell based upon some finite actions on Earth. And certainly an argument could be made for that if we spoke strictly on a moral level. But we don't. We speak on a much different level and that being a level based upon the depravity and sinfulness of man and the rejection of Christ's sacrifice on the cross for our sin. So I personally do not participate in a morality conversation and a comparison of moralities, but always try and steer the conversation to righteousness, holiness, sin, repentance and Christ's death and resurrection.