I mean don't get me wrong I'm still a believer but some things I just don't understand. Like if God knows everything and knew that Lucifer was going to bring sin into the world then why did He even create him in the first place? Couldn't Satan still repent if he wanted to and wouldn't God forgive him then?
Satan is a fallen angel.........all angels, just like humans were created with FREE WILL. Angels were created, They are a creation of the Christ who was with God and was God in the beginning. (John 1) "For by Him all things were created, IN HEAVEN AND ON EARTH, visible and invisible........" -- Col. 1:16
Angels, created with free will can make errors and sin, "For God did not spare angels when they sinned, but cast them into hell and committed them to chains of gloomy darkness to be kept until judgment." -- 2 Peter 2:4. Satan is the God of this world (2 Cor. 4:4) Christians are called out from the world (John 17:14). The word church literally means the Called Out.......Christians are transferred from the kingdom of darkness, this world, into the kingdom of God....i.e, Christ's church/kingdom (Matt.16).
"He has delivered us from the domain of darkness and transferred us into the kingdom of His beloved Son." -- Col. 1:13
John tells us of the war waged with the old dragon (who rebelled against God's authority), "Now war arose in Heaven, Michael and his angels fighting against the dragon (serpent)..........." Rev. 12:7 Satan defined as the dragon was defeated and cast down from heaven (Rev. 12:7-12)
The world and its master (the old dragon) hates the truth revealed in the Word of God. I guess Satan adheres to the axiom of John Milton's Paradise Lost, "Its better to rule in Hell (hell on earth is literal......its filled with pain, suffering, loss....etc., )than to serve in Heaven" If you are a Christian you are conditioned to FEED YOUR ETERNAL SPIRIT which belongs to God to judge as He will....rather than to live for the flesh as explained by Jesus when informing everyone of His mission statement....to feed the human soul, not the flesh. His purpose was to preach the truth from Heaven, feeding the spirit of man. (Luke 18:37, John 6:26-27) Jesus Himself turned away the poor that were following Him wanting more fish and loaves....and He told them they followed Him for the wrong reason, His duty was to feed the spirit not the flesh which perishes.
The Kingdom of God....aka, the church purchased with the blood of the Christ is a spiritual kingdom not a literal physical kingdom.......that kingdom resides within the heart of the believer. (Luke 17:20-21). Jesus Himself informed everyone that His Kingdom was not of this world. (John 18:36) Christians are promised nothing extra from any other person on earth......the fain falls on the just and the unjust. Salvation comes after this race called life is over (1 Cor. 9:4)......in the meanwhile we are all tempted, suffer, love, become ill, etc., all based upon the daily free will decisions of this world. Run this race to win the promised crown of victory......its a gift of God's grace because none of us are worthy of salvation void of the sacrificial blood of Christ (Heb. 9) Not one is righteous (Romans 3:10) If we say we have no sin, the truth is not in us........but our Christ is there to cleanse us of unrighteousness with His Blood, we make the Christ a liar if we say we cannot and do not sin. (1 John 1: 8-10)