So you have your 'natural' and your 'supernatural' and anything that science can explain goes into Bucket #1 and everything we can't goes into Bucket #2. Except that as we go on, more things get taken from #2and put in #1. There is no supernatural: merely the natural we don't yet understand.

As to theists, there are, broadly speaking, two kinds.

The clever, educated types who talk about immanence and First Cause and Abolute and construct all kinds of complicated arguments to show that this Being must exist. They put in a lot of work, but fall down in sensibly explaining why such a Being would give an airborne fornication about what humans do, think or say. Then there are the 'regular' believers, who actually believe that 'somewhere out there' is a big blue chap with too many arms, or a smiley fellow sitting cross-legged at the centre of everything, or a cranky old gentleman on a golden throne. Theydo that because the Universe is too bloody big to handle, so they humanise it.

Atheists are people who think the anthropomorphic deities are primitive and the First Cause bunch are talking out of their arses. It's an opinion, not a philosophy, much as they would like it to be.

Given the choice, most folk are amoral. They'd rather steal than work, and prefer casual sex to committment. So rules get made up by smarter people (who are also pretty much amoral), and are enforced in ways varying from brute force to clever manipulation. The aim being to force people to work and to stay in easily-controlled economic units (families), so that the smart people get the ego rush from giving other people orders and the best of everything without actually working.