Satan words were scripture
No they weren't. He misquoted the Scripture in order to render it a different meaning, even as he did in the garden. Jesus defeated him by quoting the Scripture accurately, and giving it's true meaning.
Once again: Divisions come by interpretation and teaching of Scripture. And those divisions usually come by not making accurate difference between what is written and what is not.
The one you cite may indeed be an AT.
No, it is an AT without doubt, nor shadows of understanding. It is what it is. 2 + 2 = 4.
We don't need to stray from acknowledging reality in order to be humble about knowing the things of God.
Now, whether it is
believed or not is another matter, that does make a big difference in a person's heart and mind and life.
What man can say that he knows them all?
The man Christ Jesus.
There is a difference between knowing what we know of an absolute certain, because we read and believe what is plainly written, and knowing all things of God in Scripture. That is the goal, that will be achieved, when we no longer see through a glass darkly. And in this life, we can see through that glass clearer and clearer.
What about being led by the Spirit instead of by the flesh? Does the logical mind decide, or does God?
We know the difference by knowing the Scriptures, by which we know the difference between good and evil.
The Spirit of truth never leads nor guides anyone contrary to Scripture.
We don't need to overthink things, and bring in unnecessary doubts and confusion. Scriptures are given by God in order to reveal Himself and His will for us clearly and accurately. They are not given in order to make things more mysterious and doubtful.
People who say they are believers will disagree about what is plainly written and what is not. What and where is heaven or the heavens? What and where is the earth?
These are things that can be explored, if there are any Scriptures revealing them, but they are nothing to do with salvation by faith and fellowship of the saints.
What man is in or has been in the three heavens, but the man, Jesus?
Paul spoke of one man he knew, and it wasn't Jesus.
Are we, the little bit of dirt that we are, not the earth?
Them sanctified in Christ Jesus are not just a little bit of dirt. The body is, but not the soul, the mind, and the spirit: they are eternal.
It's one thing to abase ourselves, that God may lift us up, and it is another to purposely degrade ourselves as dumb dirt. That's not humility, but an appearance of it, that is false:
Let no man beguile you of your reward in a voluntary humility...Which things have indeed a shew of wisdom in will worship, and humility.
I'm not at all saying you are doing this. But I do suggest we can overplay the 'humble' thing, when it comes to knowledge and understand of the truth.
If we think we know, we know not as we ought to know, but we can certainly know many things for sure, as we ought by reading them in Scripture.