I don't understand why you're asking the last question on your post since I, sadly, haven't been following along,,,
But I know
JLB believes there is ACTION after REPENTANCE.
Otherwise, repentance would be of no value --- if we just kept living our life as before. This would mean there was no repentance...no turning from our ways to a the new way of God.
As to immersion of infants....
There should be no such practice.
Baptism of the water prepares us for Baptism of the Holy Spirit.
John the Baptist said that HE baptized with WATER, but there was one coming after him that would baptize with fire and the Holy Spirit.
Matthew 3:11
Jesus said to wait in Jerusalem....
Because POWER would come upon us when the Holy Spirit came.
Acts 1:8
So, we are saved when we believe.
Then we follow the Lord's commandment and get water baptized.
We are also empowered by the Holy Spirit,,,,either at baptism, or at some time
after when we are ready to accept the Holy Spirit and our new way of life.