I read your long post and can see why you think as you do. I am not a fan of religion either. As for Satan and devils and demons they just are myths of ancient teachings. A God in the form of a old man sitting on a throne issuing judgements is also a myth to me.
I know we are spirits inhabiting a physical body because I have experienced being out of my body. I rather think God is a rank we can achieve spiritually. Much work has to be done for it. Compassion, love, and understanding far beyond what we have at this time in our spiritual life. Those that do achieve the rank of God look over us, and the physical world that is our school. They encourage us to follow them in love and compassion for all.
It is our responsibility to listen, and learn as much as possible about ourselves and others.
And see, i'm completely open to that being the grand reveal waiting behind the curtain of the afterlife. In a way, it would make a lot of sense if our purpose on earth is to prime us for our eventual road to potential godhood. And if that ends up being the truth of the matter, i'd happily take on the teachings of the far older, wiser humans with the perspectives of gods, and hope i could someday become something akin to them.
I'm also in total agreement with your final conclusion, cos i think that sums up my overall point too. I think our responsibility
is to listen and learn, as well as pursue the goodness within us, whatever external well that goodness might spring forth from. We need to learn to love ourselves and love others, and from what i've seen, blindly & unquestioningly sticking to the teachings of a singular faith is no guarantee one will achieve that.