I am not religious or anything, but I think some of the religious rules come from their leaders realizing that making them "rules from God" would benefit their people and give a better chance of survival:
- kosher rules are pretty much there to prevent people from preparing food in unsanitary ways or eating potentially dangerous stuff (eating pork will kill you by worms growing in your gut)
- the 10 commandments are basic community rules to ensure they don't end up fighting and killing each other, helping the race to survive.
- fasting on Ramadan was probably created by a religious leader who felt better after doing it himself and though it to be a good idea for everybody else to do it.
- kosher rules are pretty much there to prevent people from preparing food in unsanitary ways or eating potentially dangerous stuff (eating pork will kill you by worms growing in your gut)
- the 10 commandments are basic community rules to ensure they don't end up fighting and killing each other, helping the race to survive.
- fasting on Ramadan was probably created by a religious leader who felt better after doing it himself and though it to be a good idea for everybody else to do it.