Deities have traditionally been created to explain things that humans cannot or will not (as in refuse to) comprehend. You can see this plainly in the polytheistic religions where they have gods for every known phenomenon.
"Hey! It hasn't rained for weeks and our crops are dying."
"Zartok the Wet must be angry with us!"
"Let's sacrifice a goat to Ko'chal so the ground becomes more fertile."
"I think it's not raining because we live in a fucking desert." :/
"KILL THE BLASPHEMER!!!!!"
