The root of most atheism is not argument but attitude, not intellection but feeling, not the love of truth but the fear of truth...The point —that atheism's origin is not intellectual but volitional and moral -follows from Christ's promise that all who seek (God) will find (him). For unless this promise is a lie, and Christ a liar, there can be only two causes for not having found God, that is, for unbelief: (I) not seeking him, or (2) time. For eventually, however long the delay, all seekers find.

Peter Kreeft

We know this to be true because atheists existed long, long before there was anything that they now call evidence. In fact there is no evidence “for” atheism. It's simply a chosen belief to deny any power greater than self.