So Satan for you is a limited being in other words.
I believe the Father to be both transcendent and immanent. You can't get much more immanent than a human incarnation. But also through the Holy Spirit.
Let's put it this way: I don't believe in an omni-anything being. As I said, my beliefs are mostly influenced by Greco-Roman thought and they didn't believe that the Gods are all-powerful, etc. Satan is but one God out of very many, same as how Lilith is but one Goddess out of very many. I just so happened to accept Satan as my patron God.
Do I think there's a cosmic force or whatever we may call "God"? Probably, but that's closer to pantheism or the Hindu Brahman. I view the cosmos as a bit like a mind that's unfolding and changing. Funny how brain cells look like the universe. As above, so below. The microcosm is a reflection of the macrocosm. But as for the personal Gods, I think there's different types but none of them are a cosmic, universal "God".
As for Gnosticism, there are forms of Satanism and Luciferianism influenced by it, especially Luciferianism. Gnostic Luciferianism definitely exists. Some of Gnosticism is very interesting to me and I have strongly considered becoming a Gnostic. I am also influenced by Orphism. But my views on Satan mostly come from aspects of Greco-Roman, Christian and Jewish myth as well as Romantic art and poetry. In terms of the LHP, I probably agree the most with the teachings of the Temple of Set, but I don't use Egyptian trappings. Aleister Crowley is a big influence, as well.