It's the lack of understanding in OP theology between justification, sanctification and perfection.
I was always taught and I still believe you are forgiven when you repent. Now this begs the question, "If you are forgiven at repentance but are still destined for hell, what were you forgiven of?" If you owe a debt and the person you owe says you're forgiven of the debt but still demands you to pay them back, are you forgiven of the debt?
Teachings of the Bible that are more difficult to understand are to be interpreted in light of those more easily understood. Scriptures that seem to connect baptism to salvation must be interpreted in light of scriptures that don't support that notion.
To as many as received Jesus, to them gave He the power to become sons of God. My children are expected to mature and grow and obey me, but they are my children nevertheless. The fact they were born made them my children. I expect them tom learn to read and write eventually, but if they don't, they're still my children.
We become children of God through faith. We are justified by faith. We are made right with God. The thief on the cross could do nothing but believe and Jesus declared he would be in paradise. And the argument that he was still under OT salvation fails because he couldn't even meet those requirements.
If anybody goes to heaven without being baptized you cannot say that baptism is absolutely essential for salvation. The message of the Bible is grace through faith from Genesis to Revelation.
The Tabernacle Plan interpretation fails in that its a type and shadow of JESUS not
Acts 2:38. JESUS is the tabernacle! JESUS is salvation! Receive JESUS and you get the sacrifice, you get the washing of the laver, you get the Light of the World, the Bread of Heaven, the sweet aroma of the incense, the Holy Place, the Ark of the Covenant, the Law, the Manna, Aaron's Rod, the Mercy Seat, the Holy of Holies, the Shekinah---IT'S ALL IN HIM!!!