Well, we know from the words of Christ, that no one had ever ascended to heaven
13 No one has ascended into heaven except he who descended from heaven, the Son of Man. 14 And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up,
John 3:13-14
Not even the OT saints were able to receive the promise before Christ:
And all these, though commended through their faith, did not receive what was promised, since God had provided something better for us, that apart from us they should not be made perfect.
Hebrews 11:39-40
Even after Christ was raised from the dead, Paul still states believers were still sleeping
Then he appeared to more than five hundred brothers at one time, most of whom are still alive, though some have fallen asleep.
1 Corinthians 15:6
Paul goes even further to explain that if Christ isn’t raised then those who are sleeping have perished (that doesn’t sound like people have immortal souls).
And if Christ has not been raised, your faith is futile and you are still in your sins. Then those also who have fallen asleep in Christ have perished.
1 Corinthians 15:17-18
He goes even farther again, to say that if there is no ressurection, than nothing matters for tomorrow we die.
But if the soul goes to heaven, as you say it does, well than there is hope in life after death
before the ressurection, which is the opposite of what Paul says
What do I gain if, humanly speaking, I fought with beasts at Ephesus? If the dead are not raised, “Let us eat and drink, for tomorrow we die.”
1 Corinthians 15:32
Christ is the 1st fruit of being raised from the dead and ascending to the Father.
But in fact Christ has been raised from the dead, the firstfruits of those who have fallen asleep.
1 Corinthians 15:20
And here is my biggest point:
If Christ did not ascend to heaven until AFTER he was raised (John 20:17), why would we ascend to heaven BEFORE being raised?