I've seen this theory from a lot of people that people in primitive societies didn't know how babies were actually conceived, with most of the evidence not really being concrete and based off speculation. One of the main arguments is that after the advent of agriculture, males found out their role in pregnancy and therefore started to create different religions wherein God is a man and he can reproduce through ludicrous parts of his body (armpits, forehead, mouth, etc).

This seems to indicate that fathers didn't even exist back then, and that fatherhood in general sort of started out as this strange realization about how basic human biology works. I wouldn't call it an "envious attack on mothers" which researchers like Sebastian Kraemer claim, but I'm still skeptical. Can anyone explain?