Why is more plausible?

Islam and Christianity are meme viruses and nothing more. They are the most populous and last longing religions because they successfully exploited human psychology by pushing the right buttons. They were selected culturally in a manner uncanny to that of natural selection.

vs

>civilized individual from the present:
This ancient book makes a lot of outlandish claims, are you sure it's factually sound?
>uncivilized middle-eastern sand nigger from cave days:
yes. this what god told me. you must obey this from now on
>civilized individual from the present:
Sure thing, I'll start right now shall I?
>uncivilized middle-eastern sand nigger from cave days:
yes :)