Your idea of regeneration differs from mine in that the HS takes an active roll in remaking the creature, convicting and forgiving the sins …. That becomes a long lasting (some would say permanent transformation). You see it in the changes, it’s a born new experience.
I could quote thousands of historical writings demonstrating my understanding of Baptism is universal for the first 1500 years. Infant baptism and regeneration.
But I think the problem always seems to stem from a Protestant idea that the entire Church was universally deceived at some time. All the times mentioned, vary from Protestant to Protestant.
I looked everywhere for it. I wasted years looking for a break in Orthodoxy from the early Churches position on Baptism and infant baptism and the Eucharist.
All I found was universal doctrines.
Baptism = Regeneration, Universal.
Infant Baptism = Consistently practiced for the first 1500 years universally.
The Eucharist= The Body and Blood of Christ, Universally.
Protestantism is not a return to earlier Church beliefs, it is a break from Early Church beliefs, and it creates a historical mythology to justify its unbeliefs.