So if Satan was chosen as the perfect Angel to be close to God.. WHY did he rebel? [Spirituality & Religion]

Lucifer represents disobedience and the root cause of it. Satan is the id. " I want", " I need", " I will". The whole story is a way for primitive superstitious people to process the concept of man changing from a creature of instinct to a creature with the capacity for 'reason' and 'abstract thinking'. As a creature of instinct, you are not aware of things like 'nakedness' and 'dishonesty' or the difference between killing and murder. The sin of Adam is the side effect of reason. Evil. The id. We are indeed born with it, but it doesn't truly manifest itself in action until the so called "age of reason". The anthropomorphism of the id, Lucifer, saw power and wanted it. The millisecond, that thought entered the characters mind, it was cast out of Heaven along with any other celestial beings who harbored the 'ambition'. It's pure genius, and probably extraterrestrial in nature, but it's a fictional object lesson for homo sapiens in dealing with their newly evolved ability for abstract thought and reason.
Haven't you ever asked yourself about the 'omniscience paradox'? Doesn't it strike you as odd, that an omniscient being would constantly and consistently act as if it wasn't omniscient at all? It shows up right away, and becomes unnervingly obvious in Genesis 6:6, and then the non omniscient behavior continues throughout.
In my opinion, there is a supreme being and intelligent design, but it's pretty obvious to me that mythology is a necessary 'teaching tool' to give us some grasp of ideas that are, to this day, beyond our capacity to comprehend. Even extraterrestrial hybridization is touched on in Genesis, when the son's of God saw the daughters of men and mated with them to produce the Nephilim.