This is as purely hypothetical as hypothetical gets…
Let’s say that Jesus had never been crucified.
If Jesus had never been crucified, that means two things,
a. The Jews recognized that He is divine.
b. The Gentiles also recognized His divinity.
Ipso facto, the entire world would begin to worship Jesus Christ. Whether He would have a Church to communicate His Teachings, is debatable since the current Jewish authorities would have accepted His Teachings and could therefore continue to Teach His Word, but
this time, infallibly. Of course, Gentiles would now be accepted in the ministry.
Another thing, the Jews who had sinned in the Old Testament era, would have to be released from the Limbo of the Fathers. So, He would have laid His life down, without any violence, like the Virgin Mary’s Dormition and “descended to the dead” in order to lead them into Heaven.
As a Priest in the line of Melchizedek, He would have re-established the Toda Sacrifice but this time with an efficacious dispensing of Sanctifying grace. Whether the other Sacraments would be identical to those we have now, is a good question.
Would He have lived out a normal human life span and died naturally of old age?
What is a “normal” human life span?
And if He had, would this experiencing mortal death have been sufficient to redeem us?
As the Saints have said, “even a drop of His blood is sufficient to redeem the entire world.”
To anticipate the most obvious objection, if He had never been crucified, the Scriptures that describe the suffering of the Redeemer would not have been fulfilled.
Prophecy is of a nature which can be discerned from the events of Jonah’s announcement to Nineveh. The Jews and Gentiles were like the Ninevites. If they had responded to Jesus’ visitation the way that the Ninevites had responded to Jonah’s warnings, their end would have been much different.
Luke 19:43 For the days are coming upon you when your enemies will raise a palisade against you; they will encircle you and hem you in on all sides. 44 They will smash you to the ground and your children within you, and they will not leave one stone upon another within you
because you did not recognize the time of your visitation.”