My experience of atheists is that, those I have met and talked to, do not really deny the existence of God (or any god or gods) due to lack of evidence. Underlying and causing their atheism is (I detect) a resistance to moral accountability. They do not want to believe that they are or will be judged because they want to live as they want to live without judgment other than their own.
I have trouble taking atheism seriously. It is so clearly a product of modernity and (in my view) so clearly goes against the grain of everything we humans believe in (e.g., objective morality that transcends tribe, culture and custom) that I find it almost amusing—except that it can and often does have extremely pernicious consequences.
~ Roger E. Olson
(Hat tip: Amorality of Atheism Facebook group)