What Happens In Exodus 17
Israel is barely out of Egypt. Amalek attacks. Joshua leads the fighting and Moses goes up the hill with the staff of God in his hand.
While Moses holds his hands up, Israel prevails. When he lowers them, Amalek does. The staff is the same one from the plagues and the sea.
They put a stone under Moses to sit on and hold his hands up, one on each side, until sunset. He could not do it alone and the text says so plainly.
Afterwards Moses builds an altar and names it. Not a monument to the win, an altar, which is a place of offering rather than a trophy.
This phrase appears once in the Bible, here. Any teaching that treats it as a standing title for God is adding something the text does not say.
A raised staff visible to the whole valley, and a name given afterwards that says the visible thing was God Himself.