There is never a good reason for one Christian to Destabilize another Christian. Period.
We aught always to be ready to Edify one another. That means we build each other up.
How often do we see one 'Christian' criticizing another Christian in a public venue?
Why do they do so? To destabilize the work that the target is embarked on.
How much Theology is necessary to be Born Again?
That if you shall confess with your mouth the Lord Jesus, and shall believe in your heart that God has raised him from the dead, you shall be saved. - Rom 10:9
For whoever shall call upon the name of the Lord shall be saved. - Rom 10:13
I don't want to hear any 'but, but, but...' qualifications to the perfectly clear Scriptures above.
Hence, that 'Christian' that does not believe exactly like you do is not to be destabilized by your attacks.
But whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea. - Mat 18:6
Again, We are to Edify (build up) one another. We are never in God's will when we act to Destabilize another Believer in their Faith.
Those who believe that Holiness is the goal of all Christians are invariably finding fault with everyone.
When Jesus returns He will not be looking for Holiness. After all, He is the Holy One of Israel and we have His Righteousness imputed to us by our Faith in Him. 1Co 1:30 Phi 3:9 2Pe 1:1
Nevertheless when the Son of man comes, shall he find faith on the earth? - Luk 18:8b
Jesus will return looking for Faith!
Faith is the Knowledge of God's Love, Grace and Mercy to us.
Guilt is the awareness of Condemnation.
Guilt Destabilizes Faith.
For this reason God has willed that we receive His Righteousness by Faith in Christ Jesus. By doing so, He has denied the power of Guilt to Destabilize our Faith in Him.
There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit. - Rom 8:1
You say that this only applies to those who walk after the Spirit. Correct.
"My Words are Spirit and they are Life". Joh 6:63
Believing the Word of God is walking in the Spirit!
For God sent not his Son into the world to condemn the world; but that the world through him might be saved. - Joh 3:17
He that believes on him is not condemned: but he that believes not is condemned already, because he has not believed in the name of the only begotten Son of God. - Joh 3:18
A straighforward reading of the Word tells us that we are not Condemned by God because of Christ Jesus. Therefore, we aught not to bring Condemnation on each other.
Let us therefore follow after the things which make for peace, and things wherewith one may edify another. - Rom 14:19
And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers;
For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ:
Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ: - Eph 4:11-13