It's like you joined this debate a couple years ago.
I'll draw a picture and show you an old definition.
Atheism is, in the broadest sense, the absence of belief in the existence of deities.[1][2][3][4] Less broadly, atheism is the rejection of belief that any deities exist.[5][6] In an even narrower sense, atheism is specifically the position that there are no deities.[1][2][7][8] Atheism is contrasted with theism,[9][10] which, in its most general form, is the belief that at least one deity exists.[10][11][12]