During his short life on earth Jesus talked about Visitation, Tribulation Heaven and Hell. He also talked a lot about Salvation, which dependent on the context could have meant earthly or heavenly. He left behind no definite scripture and referred us to the Holy Spirit and the Apostles. The church got dispersed and grew independently in geographically isolated pockets. Scripture was written down around the year 70 AD which coincides with severe persecution and the destruction of the temple. From 140 AD onward a small Canon was compiled and by around 400 AD we arrived at the type of Canon we nowadays use in our Bibles. My point is that the precise definition of salvation has been left unresolved by Jesus and the apostles and has remained a contentious issue up to this very day. So the classical answer remains What is impossible with man is possible with God !
Click on more to see links covering the wide spectrum of beliefs that stem from attempts at interpretation and disambiguation of the bible.
https://www.catholic.com/qa/what-is-the-catholic-understanding-of-the-biblical-plan-of-salvation
en.wikipedia.org/wiki/Lordship_salvation_controversy
https://www.lds.org/media-library/video/topics/plan-of-salvation?lang=eng
https://www.lds.org/youth/learn/yw/plan-of-salvation/what?lang=eng
https://en.wikipedia.org/wiki/Plan_of_salvation_(Latter_Day_Saints)
19Jesus said, “There was a certain rich man who was splendidly clothed in purple and fine linen and who lived each day in luxury. 20At his gate lay a poor man named Lazarus who was covered with sores. 21As Lazarus lay there longing for scraps from the rich man’s table, the dogs would come and lick his open sores.
22“Finally, the poor man died and was carried by the angels to be with Abraham.e The rich man also died and was buried, 23and his soul went to the place of the dead.f There, in torment, he saw Abraham in the far distance with Lazarus at his side.
24“The rich man shouted, ‘Father Abraham, have some pity! Send Lazarus over here to dip the tip of his finger in water and cool my tongue. I am in anguish in these flames.’
25“But Abraham said to him, ‘Son, remember that during your lifetime you had everything you wanted, and Lazarus had nothing. So now he is here being comforted, and you are in anguish. 26And besides, there is a great chasm separating us. No one can cross over to you from here, and no one can cross over to us from there.’
27“Then the rich man said, ‘Please, Father Abraham, at least send him to my father’s home. 28For I have five brothers, and I want him to warn them so they don’t end up in this place of torment.’
29“But Abraham said, ‘Moses and the prophets have warned them. Your brothers can read what they wrote.’
30“The rich man replied, ‘No, Father Abraham! But if someone is sent to them from the dead, then they will repent of their sins and turn to God.’
31“But Abraham said, ‘If they won’t listen to Moses and the prophets, they won’t listen even if someone rises from the dead.’”