Stacy says all is not of God, some things are “of the devil” I said…

WHY CAN’T BOTH BE TRUE?
You’re being immature — like a child stuck on literal expressions and not knowing that there are figurative expressions too. Not knowing there is a bigger thing going on here — more than just what is apparent to the eye.
In one sense — the lusts of the flesh and the pride of life are indeed “of the devil”. And will have appropriate influential factors and consequences.
But if one takes a step back to see the larger picture of God’s eonian purpose… ALL IS OF GOD. And you can’t deny that “all is of God” is revealed in the Bible more than once.
Yes, Adam sinned… but “where sin increases grace superexceeds.” (See Romans 5:20)
Yes, Judas sinned… but without Judas’ role, we would not have a risen savior.
Yes, Joseph’s brothers sold him into slavery… but that terrible act saved them from the famine years later.
None of it makes sense unless you consider that God’s purpose is an eonian purpose.

Romans 5 talks not only about justifying each and every individual, but also “life’s justifying”

Romans 5:18 Consequently, then, as it was through one offense for all mankind for condemnation, thus also it is through one just award for all mankind for life’s justifying.

In a relative sense, the pharisees were “of their father, the devil”
In an absolute sense… “God is operating all things after the council of His will.” — Ephesians 1:11.

You are right, some things are “not of God”… as viewed during these times… but the eons will come to an end, then all will be revealed. Then we will see that indeed “all, really is of God.”

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https://goodnewsaboutgod.com/studies/spiritual/home_study/if_all_of_god.htm