Atheists like me are atheists not because the quality of life it provides, but because there's no empirical evidence that there's any truth to any of the supernatural claims ever made. We understand that faith is a choice of last resort when no other evidence is available, and that faith is a really bad way to come to conclusions. Atheists like me understand our inherent biases, we seek to ask questions in a way that there can be a negative answer. There is no such negating answer to "what would convince me there is no god" and that alone, in the absence of any kind of empirical evidence for the existence of a supernatural entity, should be enough to not be a believer.
The truth is whatever the truth is, and I want to believe reality no matter how it makes me feel. If it feels good to believe in magical things that care about us but those magical things aren't real then I don't want to believe in them.
The litany of Tarski is useful:
If the box contains a diamond,
I desire to believe that the box contains a diamond;
If the box does not contain a diamond,
I desire to believe that the box does not contain a diamond;
Let me not become attached to beliefs I may not want.