I apologize if this question is not worded brilliantly.

I am referring to the beginning of belief-Before organized religion. I suppose it could be during the neolithic period, when we had an idea of a higher power and we were doing the whole nature worship thing. (Again, I am so sorry if my idea of this is way off.)

The first person who had the original thought "there's a god/higher power up there"-What did he/she say to other people when they asked "Well how do you know that?" What was the justification that made the idea of god spread to out first cultures?