I hate to be all cynical and pessimistic here, but it honestly seems like you've had some recent falling out with your idea of "God" or some kind of internal epiphany that challenges your long-standing (and frankly, very public) positive perception of God. Now, it seems to me, that you've taken the polar opposite stance, and you're looking for external validation to reinforce your new internal narrative.
All that to say, if what I said above is true, then this is a meaningless question, rhetorical in the sense that you're not actually seeking an answer to this extremely broad and pseudo-philosophical question, but rather have formed your own opinion about it, and are looking for people to mirror your sentiment.
I strongly recommend you ask yourself, is this really productive? What difference does it truly make if philosophically "God" and "Satan" are a dualism and two sides of the same coin as an entity? The underlying sentiment of both of them remain the same, even if deeply subjective depending on your religious and spiritual stance.
What insight do you hope to gain? I hope it's not "aha! I knew it! Everyone agrees with me that God was evil all along... that's why all those bad things happened to me!"
Worth a read:
It's something very common in the tech/IT space, but I have increasingly found it applicable here in the occult space as well.