If people had access to heaven before Jesus but are now restricted by belief in him, it appears that Jesus has not come to save mankind but to condemn most of them to hell.
Before Moses came and gave the law the world was without form and void, and darkness covered the face of the deep. According to the story people turned aside from the way he taught to follow the law after he died but before he died he promised that God would send another, like him, to straighten things out. "I will put my words into his mouth and he shall convey all of my commands."
So it was not until Jesus came that anyone could possibly understand the law or received the promise of heaven for compliance. The door had been closed for over a thousand years. No one had access to heaven, no one even had an inkling that they were dead.
Jesus did not come to condemn people to hell, he came to lead people out of it. People who heard his testimony and rejected it in preference for the the status quo remained behind, effectively condemning themselves.
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