...God is so other than humanity....
Among the truest statements ever posted.
I suspect the answer to the OP question lies in what was going on before creation of this world...
Was there something going on before the beginning?
...that would make the fall neither a plan of or a plan for the fall. A perfect action. About all we can say is, "It just is."
I f I understand correctly, It's like my getting into my car and turning on the ignition. The cam shafts and crank shafts turn, the electricity flows, the pistons move, and all the constituent elements of the engine work to move my vehicle down the road but I am nor "planning" any of it. It all works simply as a function of design. Yet, despite that design, the imperfections of design and manufacturer and those of the world in which it operates, the engine will eventually fail. It will wear out. Some certain imperfection may cause a misfire that breaks a microscopically defective piston rod stressed by high temperatures, enormous pressure and an actual miniature explosion.
Creation was designed to work, and it was designed to work exactly according to God's design. It was a perfect and perfectly good creation BUT
by God's design there exists two types of creatures with the potential to pour sand into the otherwise perfectly designed, perfectly running engine that didn't have any manufacturing defects until a pair of fools took a hammer to it.
I used to work with a guy who had doctorate degrees in physics and mechanical engineering, along with an MBA. Really smart guy. Could design, manufacture and fix anything, and then sell it for lots of money but compared to God he's an imbecile. God is the Maker of Physics, Mechanics, Engineering and Fruit-bearing.
For our perspective inside the fishbowl full of dirty water things look like a mess, but there is not a single particle of an atom that isn't doing what it was designed to do - either in thesis or antithesis.
We are introduced to a being in the Garden of Eden that is evil. He was already there.
I would clarify that to say he was already there by the time Genesis 3 occurs. I am unaware of anything in scripture informing us the adversary was around in sinful form between Genesis 1:31 and Genesis 3:1 but I am positive he was not in Eden in sinful form prior to Genesis 1:31. An evil creature living in a good creation and God calling it "
very good," is self-contradictory.
God created everything He made in six days and at the end of that sixth day He examined and appraised everything He'd made and having done so He declared it very good. A utilitarian good, especially one with an evil creature and/or one where the means justify the ends is untenable with a God who declares woe on anyone who calls good "evil" (and vice versa).
So the adversary was there by Genesis 3:1 but he wasn't there in evil form prior to Genesis 1:31.
And he is allowed to tempt Adam and Eve.
Possibly, but I am not convinced "allowed" is the correct term. It's understandable such an appeal would be made because of the precedent of Job where God consents and the theological premise all things occur by either God's willful mandate or His divine consent, but there is a third option:
design!
Satan does what satan does. Satan does what satan does and satan doesn't have to ask to do it; he cannot help but do what sin makes him do and the only one sovereign over sin is God. Satan is not a free agent, an autonomous creature who does anything apart from his Creator, but neither is he free to do anything apart from the sin that has made him dead and enslaved. Satan is a minion. He is a liar, the father of lies, and lying and murdering is what he does. If the tradition of Lucifer become satan is correct, then he's not a happy camper. His entire existence is one of misery. He is a carrion-eater and he can do nothing but "eat" the dead. He's a carp, a catfish, a
scavenger. That is the purpose he serves in the Creator's creation.
That does not preclude God using him for specific purposes, but God does need to micromanage this as if what He designed will stop doing what He designed if He doesn't constantly keep an eye on it. That god is not a God. Again, I remind everyone of the dependency issue. God is not dependent on His creation and most definitely not dependent on sin. This is one of the reasons strict determinism is oxymoronic: if God MUST micromanage everything then He becomes a slave to His creation. God's plan cannot make Him dependent; it cannot reverse the issue of requirement to forcibly require God to do anything lest He and His plan fail.
That being said, yes, it is possible God "allowed" satan to tempt Eve and then Eve tempt Adam, but what God ordained from eternity did not make Him the author of sin or do violence to the will of either of the three creatures involved, or the contingencies of their respective causalities.
And our first parents fell from their perfect estate. That is what we know.
Yes.
Very important observation because they were good, unashamed, sinless creatures living in a good, unashamed, sinless world BUT they were also corruptible good, unashamed, and sinless creatures.
That is the way they were made. They were designed to be corruptible..... and perfectly so
. There was, conceivably, logically, the ability to remain in the good, unashamed, sinless never-corrupted-but-still-corruptible state but they'd still need the tree of life. They'd still need Jesus.
That, too, is what we know.
Though I often casually, speculatively, and not too seriously remember the first chapter of Job in this respect.
We know from what scripture tells us that the complete, full, in all its detail was known within the Godhead as the covenant of redemption. When was it known? From all eternity? God has all information, He does not learn it.
So, side tracking a tad, if more of us would contemplate such things as that from time to time, we may find that fear of God (reverence and terror)and some of the careless remarks about Him we see might diminish.
I'm not sure why Job or any of the other post-Genesis 3 persons were brought up in this thread. They are all examples of post hoc conditions. Any evidence of a "plan" they provide is that only of after-the-fact. David seduced and killed Uriah so God must have a plan for his doing so is a false-cause argument. That is the fundamental error of this op (and much of the rest of the thread). A better explanation is that David did what sinners do, and it doesn't much matter to God because 1) God has an all-encompassing already-existing plan that is unaffected by the miniscule creature's particular sin, and 2) it's all going to serve His and only His purpose.
God has mercy on whom He has mercy and it does not matter how the creature runs or wills, but on the will and purpose of God. The clay cannot say to the Poetter, "Why have you made me this way?" The Potter makes the elements that make clay and then He makes the clay, and the wheel upon which the pot is thrown, and He makes the pot with the features He wants the pot to possess and He and He alone decides the purpose of the pot. Some pots are made for noble purpose and some pots are made with ignoble purpose, quite often if not always one pot is hated before it is ever made and others are loved, and it does not depend on how the pot works or wills, but on the work, will, and purpose of the Creator.
God started out working with pure, good, unashamed, sinless, completely unadulterated clay but a trio of fools took it upon themselves to spoil the clay simply because they could. That's the way God originally designed the clay. Since that corruption, they clay has not say. All the clay is defective, and every pot has air bubbles in it that will cause the destruction of the pottery when it is subjected to fire.
Only grace changes any of it and the only one who does and can have any grace sufficient to fix those problems is God.
If Job was not fictional then Romans 3:23 applied.
Romans 3:23
...for all have sinned and fall short of the glory of God...
So too did Romans 3:24.
Romans 3:24
...being justified as a gift by His grace through the redemption which is in Christ Jesus...
As well as Romans 3:25
This was to demonstrate His righteousness, because in the forbearance of God He passed over the sins previously committed...
The plan is not about us. We are not the focus of scripture. We are not the plan. Christ incarnate, crucified, resurrected, and ascended.... the first born of many, is the plan. Sin did not hinder that plan an iota of a smidgen.
(apologies for the length)