Not even close. Atheism is nothing more than a lack of conviction in the existence of a God or gods. Anyone of any political persuasions can lack conviction.
That's more of a definition of agnosticism. Atheism is a FIRM belief and faith that there is NO God or gods. None.
Atheism comes in a scale, weak atheist at one end, strong atheist at the other. Any reasonable atheist would change their position if evidence for the existence of a God or gods came along
