The Satan question is a tough question. It goes back before the beginning of time. (It may be part of Satan's accusation against God before the world as we know it.) The answer again has to do with free will and with God revealing who he is. It is an abstract answer and we will never fully wrap our minds around it. For God to reveal who he is he created free agents (in this case) who would then respond to God's nature. Satan chose to rebel which simply moved God's plan forward. Independent of my answer being correct or making sense, God is still in control and God is still good. There will always be questions (I have questions and some apparently conflicting ideas) but we know enough about God and about Truth to place faith in God and move on in faith. Indeed, to have any faith at all you must have some questions answered and something to believe in. But, eventually we all run into a wall that we can no longer see past or understand. This is where we say with the Apostle Paul, "We live by faith, not by sight."
"The SECRET THINGS belong to the Lord our God, but the THINGS REVEALED belong to us and to our children forever, that we may follow all the words of this law." Deuteronomy 29:29Galyn Wiemers