They were saved the same way the woman in Luke 7 was saved.
(Luke 7:50) Jesus said to the woman, "Your faith has saved you; go in peace."
Salvation is by faith, and faith alone.
That's why Peter quoted Joel in Acts 2
(Acts 2:21) And everyone who calls
on the name of the Lord will be saved
Paul said the same thing:
(Rom 10:9) If you declare with your mouth, "Jesus is Lord," and believe in your heart that God raised him from the dead, you will be saved.
However, before 70AD the salvation was not complete until Christ Jesus returned from the Holy of Holies after presenting His blood as a one time sacrifice for all sins. In 70AD Jesus appeared, and in doing so the atonement was complete.
It's the same thing the High Priests did under the Mosaic Law.
That doesn't mean believers in Christ were not saved before 70AD.
Somehow MAD claims the "kingdom" believers weren't really saved the same way the "body" believers were saved. Despite the fact that Peter and Paul said almost the exact same thing about being saved.