One point: God NEVER created an evil Satan. God created a freewill Lucifer who chose (and thus allowed) evil to exist. Evil by definition = rebellion from truth.
god created hasatan, who tests men. if that's evil, god created it.
lucifer is a misnomer. lucifer is a latin rendering of "heylel" which loosely means "bringer of light" in hebrew. literally translated into latin, that would be "lucifer" which means the same thing. both words are probably literally refering to the planet venus, which heralds the dawn half the year.
but by the context (isaiah 14?) the title appears to applied to the king of babylon, nebuchadnezzar. not any spiritual being, although it seems to be playing on some lost ancient babylonian legend.
either way, lucifer ≠ satan, and there is not evidence of a fall of any kind. in the context of the bible, or at least the ot, satan strictly serves the will of god.
this concept is completely in line with biblical philosophy. it's nothing shocking to think that all evil originates from god. where else would it come from? is god not the creator of all things?
quote:
Isa 45:7 I form the light, and create darkness: I make peace, and create evil: I the LORD do all these [things].
quote:
Amo 3:6 Shall a trumpet be blown in the city, and the people not be afraid? shall there be evil in a city, and the LORD hath not done [it]?