If there were a sixth point to Calvinism’s TULIP, it would be Meticulous Determinism. Unfortunately, this would make it TULIPM, which doesn’t sound right. Perhaps TULIMP?
Meticulous Determinism is best defined by The Westminster Confession of Faith like so:
God from all eternity did by the most wise and holy counsel of his own will, freely and unchangeably ordain whatsoever comes to pass.
This includes sin and bad stuff.
One of the particularly bad things that has occurred in the course of human events is demon possession. Demons make people crazy. They throw them into fires and convulse them and all manner of other physically harmful things.
Jesus took the opportunity to demonstrate His divinity by casting out demons.
On one particular day, Jesus was charged with being a tool of Satan. Various Jewish religious leaders said the demons were cast out by the power of Satan.
Jesus said that was silly.
How can Satan cast out Satan? And if a kingdom be divided against itself, that kingdom cannot stand. And if a house be divided against itself, that house cannot stand. And if Satan rise up against himself, and be divided, he cannot stand, but hath an end.
If Satan casts out Satan, then Satan is divided and he will fail.
The Calvinist, who believes God has ordained whatever comes to pass, thinks it’s the exact opposite: God has cast out God.
Satan gets little playtime in Calvinist/Reformed Theology. That’s because in that system, Satan is rather superfluous. God seems to be messing things up quite well on His own, thank you very much.
If The Westminster Confession of Faith is true, then people are demon possessed because God made them be demon possessed. Then Christ came along and cast out the demons God put in them.
Therefore, God is casting out God. God’s Kingdom is divided against itself and His house cannot stand.
If God is ordaining sin, making people do what He Himself says He hates, then God is divided. The Calvinistic skewed view of sovereignty says that if anyone else (Satan, man, etc) is doing things in the equation, then God isn’t sovereign.
Therefore, the only solution (since changing your theology is apparently not an option), is to distort the character of God and contradict the teaching of Jesus Christ.
It seems like a heavy price to pay.