I mean, if God exists and is an evil or indifferent God, how would we even have a desire to attain good and be noble, selfless, and altruistic ourselves?
Our desires are shaped by our genes and environment. We don't need a god , good or evil, to want to better ourselves or help others. It's already part of our nature due to the fact that we are a social animal and as such cooperation and altruism have positive effects on social groups and are selected for.
It's pretty obvious after looking at the history of religion that mankind always creates a god(s) to serve their current needs and as those needs change so do their god(s).