Would you agree that atheism / naturalism has a less solid basis on which to ground morality?
https://www.theguardian.com/commentisfree/2012/mar/09/life-without-god-bleak-atheism
Even more disturbing, perhaps, is the threat of moral nihilism. Atheists are quite rightly keen to counter the accusation that life without God cannot be moral. The British Humanist Association, for instance, claims that "Right and wrong can be explained by human nature alone and do not require religious teaching". But, just as with happiness, there is a need to distinguish the possibility of atheist morality from its inevitable actuality. Anyone who thinks it's easy to ground ethics either hasn't done much moral philosophy or wasn't concentrating when they did. Although morality is arguably just as murky for the religious, at least there is some bedrock belief that gives a reason to believe that morality is real and will prevail. In an atheist universe, morality can be rejected without external sanction at any point, and without a clear, compelling reason to believe in its reality, that's exactly what will sometimes happen.So I think it's time we atheists 'fessed up and admitted that life without God can sometimes be pretty grim.