well theoretically if there is no God.... why would anyone need to ever have morals, perform acts of kindness, help others, or have any incentive to be "good"
just live your life as an evil bastard, rob, steal, rape, murder and take whatever you want how you want when you want...
as if there is no God you then have nothing to worry about
People are created in the image on God and as such are imbued with his qualities regardless of whether or not they believe in him.
The image of God is often associated with our physical traits, but in actuality it's aligned with our spiritual qualities....our souls....the essence of who we are when flesh and bone are gone.
Whether theist or atheist, we can exhibit qualities of grace, mercy, love, justice, compassion, anger, jealousy, etc....just like God.
Simple difference between atheist and theist is that their morality is subjectively based via a majority of folks (or a sampling or folks) while theism is objectively based in God. Theism appeals to a higher standard while atheism appeals to a consensus of its adherents for it's conclusions. Yet atheists never acknowledge that the goodness that can be exhibited among their ranks sources not from them. The lasting hell they'll experience in eternity will come when God extracts from those individuals (and the existence they will remain in) all the qualities of himself. They will remain in a Godless state void of his image in any form or fashion.