That always struck me, the notion that the beings closest to God would ever turn from him. I had the impression -as did many other Christians I knew- that God is the ultimate being, a person of vast intellect, wisdom, and love. The perfect father, the great teacher. To meet Him would be an unimaginable experience.
And yet... one angel is so unimpressed that he turns against God, to such a degree that he earns the title of "opposer" (or something to that effect). The two humans who were direct creations of God are easily turned away from Him as well, by a talking animal of all things. Other angels apparently chose their own boners over fealty to God. That is insane.