The sky wizard strawman version of God is probably fake and gay, a superliteral boogeyman used by fedora-tipping faggots to justify an insufferable crusade against everything tangentially related to religion. If the literal version of God that sits in the sky and judges us is real, uh, sorry I guess, please don't smite me.
But religion is right about a ton of shit. The Bible is the greatest collection of fables and wisdom and what have you, western society is built on the Ten Commandments (mostly anyway), people are consistently fucking ruined by the seven deadly sins. You don't have to hold any deep spiritual beliefs to agree that you disregard the lessons of religious texts at your own peril, especially if you end up a 30+ jaded alcoholic living in a bugman hive, depressed, wondering what the meaning of life is. It's poetry - Redditors who are prideful enough to believe they're above 'stone age ghost stories', doomed to tragedy befitting something straight out of the Bible.
So, maybe God is a shared, overarching sense of... karma, almost. If you're righteous you reap the rewards, and if you're sinful then you inexorably end up ruined. I don't think God smites adulterers, but all you have to do is read r/polyamory to see that they end up getting their share. Metaphorically, it lines up pretty well. People like to shit on the line about 'if you look at a hot chick and want to bang her, that's basically cheating', but how does your wife like it if you spend time ogling insta-thots? The things we spend time doing, that we pour our energy into, shape us in turn; making a habit of browsing weirdly personal soft-core porn cannot have a good effect on you.