Athiesm is a Faith?

[Mark 13:13]

Interesting point , so I wonder what came first the Theist or the Athiest.

This is just my assumption but i assume early mankind was born with no knowledge of god, things which couldnt be understood in life were assumed to be gods hence the invention of polytheism, different gods for different things which werent understood. Then from this idea evolved the idea of a single god, but bringing with it many of the rituals which the old religions had.

without a concept of gods how could they assume something was a gods.