Is it difficult to understand that when people created a higher being for all the things one cannot explain?
Imagine the people that saw Auroa Borealis for the first time and are without the knowledge of what it is. They ended up calling it something to do with an omnipotent being. I also believe the social security that came with all believing in a higher being for those that needed a group to feel inclusive is another valid reason for why God exists. For the matter dealing with evil- if you commit evils against what god came to you in a fiery blaze told you during a moderately high opiate trip then you can decipher who is with god and who is against god so we can choose who to burn at the stake without really knowing.