Your argument goes against the chronological order of the events during the New Testament.
Our Lord Jesus Himself got baptized and was baptizing every person who was willing. In fact, the quote you love to use to justify that BOD/BOB is false, was made by Jesus BEFORE He was crucified.
If the New Law wasn't active, why would Christ and His disciples baptize as many people as they could, risking their lives against the Pharisees and others?
This is completely wrong. Baptism was put into force after the resurrection when Our Lord told His disciples to teach and baptise the nations. The old law was not not fulfilled until Christ died, Our Lord's own words were "it is consummated", the good thief diied before these things occurred.
You are ignorant on this, that's why you have ignored the fact that Our Lord's words in Paradise did not immediately refer to the thief going to heaven but that Oir Lord would be in limbo with them very shortly. Because being with God is Paradise. Our Lord did not open the gates of heaven until after He rose again, until after he Ascended into heaven being the first to do so.
You are missing the chronological order of events.