The 'first cause' nonsense has been roundly refuted as fallacious.
See https://rationalwiki.org/wiki/Argument_from_first_cause
As to your assertion:
>God is not now physical nor has He ever been physical.<
I find myself firmly in Jefferson's camp on this score:
"when once we quit the basis of sensation all is in the wind. to talk of immaterial existences is to talk of nothings. to say that the human soul, angels, god, are immaterial, is to say they are nothings, or that there is no god, no angels, no soul. I cannot reason otherwise: but I believe I am supported in my creed of materialism by Locke, Tracy, & Stewart. at what age of the Christian church this heresy of immaterialism this masked atheism crept in, I do not know. but a heresy it certainly is." (https://founders.archives.gov/documents/Jefferson/98-01-02-1458)
"God is spirit", says the Gospel of John, and spirits are imaginary, therefor God is imaginary.
Simple logic.
N_J