You said it. Converts.
Those who washed
in the tradition of Mikveh were already saved and baptized by the holy spirit.
Cleansing themselves by immersion did not save them.
As you yourself said. They were already converts.
These were Jews receiving Jesus teaching. Mikveh is ritual cleansing.
This you might find very helpful:
https://www.calledoutbelievers.org/tevilah-and-mikvah/
When they cleansed the body through Mikveh, "Baptism'', they purified their bodies by Jewish tradition . Cleansing themselves to receive the pure indwelling holy spirit.
Immersion liquid water baptism did not save them. They , as you said, were already converts,converted, saved.
Beware false teachers who abrogate with purpose God's message.
They paste false teaching to repeat the same purposeful misleading assertion in order to take away from the truth of God's work on the cross.
We are saved the moment we believe and our sins are forgiven in that moment and God will not hold those against us ever again.
That's the covenant God died to seal from the cross.
Jesus was God,The Word, made flesh who dwelt among us as Emmanuel,''God with us''.
Any doctrine that tells you you are not in God's salvation until and unless you are immersed in liquid water is Satanic by definition. Adverse to the truth of God in Christ.
Satan has his disciples too.
They can't lead God's elect from Salvation.
They can and do labor to corrupt the words of The Word.
Because chaos is their abode. And eternal hell their destiny. If they can serve to generate confusion and push adverse teachings against God's truth they'll have fun while there's still time.
And gain satisfaction if they can cause conflict among the saints. They are legion.
You are saved the moment you believe. And your sins are eternally wiped clean by the blood of the Lamb that was God and is God.
His blood sealed that promise. That covenant, for eternity.
God is not a man that he should lie.
Men pushing adverse doctrines do.
Believe God who saves.
Pray for discernment to know the lies of those who are not. God sees them and hears every word. And one day they will answer for every one of them.
I was going to leave this thread before. Now I shall. God's words reach his chosen. We can only hope to encourage our sisters and brothers to study and know the truth.
If we keep paying attention to enemies of the word that will take us into their world as we think to change fallen natural minds.
That's naive.Even arrogant. The natural mind will never understand. And it is only God who can lead the change and open the natural man's consciousness as one called by his grace into faith and Salvation.
We are simply wasting our time when natural minds are happy to stay lost. And argue why that is righteous by abrogating the scriptures in their defense.
God continue to bless and protect his Elect.
For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
Ephesians 6:12