God created Lucifer, knowing he would become Satan, and as we see in Job and other places, Satan was fully in God's employ at the time.
God created the tree of the knowledge of good and evil.
God spoke the command that made sin possible. Of that phenomenon, Paul says:
I would not have known what sin was had it not been for the law. For I would not have known what coveting really was if the law had not said, “You shall not covet.” But sin, seizing the opportunity afforded by the commandment, produced in me every kind of coveting. For apart from the law, sin was dead.
Once I was alive apart from the law; but when the commandment came, sin sprang to life and I died. I found that the very commandment that was intended to bring life actually brought death. For sin, seizing the opportunity afforded by the commandment, deceived me, and through the commandment put me to death. -- Romans 7
Had there been no tree and especially had there been no command, there could not have been sin.
IOW, the command not only made sin possible, it made sin inevitable. Adam or Eve or one of their offspring, sooner or later, would fall. Satan was the catalyst that made it sooner rather than later.
And remember that scripture already tells us that before any of these events occurred, God had already prepared His plan for redemption and salvation. Therefore, what has happened has been God's Plan A all along.
Now, a lot of Christians will deny all this in an attempt to defend God's virtue, but IMO God is a big boy and will ultimately defend His own virtue.
The problem with denying that God is the First Cause for all that has happened is that one must assert that God is either stupid or weak, and IMO a stupid or weak God is not worth believing in. When Job was assailed by Satan (prompted by God--says so right there), Job laid all the responsibility on God as First Cause:
And Job said, Naked came I out of my mother's womb, and naked shall I return thither: the Lord gave, and the Lord hath taken away; blessed be the name of the Lord. In all this Job sinned not, nor blamed God. -- Job 1
It's important for Christians to note that by acknowledging God as First Cause for both the good things and the bad things in his life, scripture asserts that Job did not
blame God. The difference between the two is that Job did not deny God's
right and
authority to do whatever God wanted to do--"blame" is not assigned to actions that one has the right and authority to do.
The other assertion might be that God is a sadist, and that is the one posited most often by the atheists in this thread. However, I've been through enough training sessions for a tough mission in my own life that I understand:
No training seems enjoyable at the time, but painful .-- Hebrews 12
My toughest trainers have always been people who most wanted me to succeed.
But one must see long range, beyond the training, and accept from the trainer that there is something beyond the training. When the coach demands, "Run another lap," one must believe there will be a race to run at the end of all this hard training.
Later on, however, it yields the fruit of peace and righteousness to those who have been trained by it. -- Hebrews 12
For my Christian brothers:
Do you not know that we will judge angels? -- 1 Corinthians 6
If that role lies ahead of us...consider what training it must entail to be prepared to
judge angels? Would it not take knowledge of good and evil to judge
angels?