“But the gift is not like the trespass. For if the many died by the trespass of the one man, how much more did God’s grace and the gift that came by the grace of the one man, Jesus Christ, overflow to the many!” – Romans 5:15
Consider the Saviour in this way: whoever does not become saved, were not save because Christ was not their Saviour. It is not possible for Christ to have been their Saviour yet not save them, otherwise, they would have been. The Saviour is only the Saviour because He saves those who are to be saved - not because He might have saved those who aren't, so, for the others, He is not Saviour. Both cannot be true at the same time - that He is their Saviour, yet at the same time, He doesn't save them.
"many" (but not "all") live because "many" (but not "all") have been given eternal life and are alive spiritually; "many" (but not "all") die(d) because eternal life was withheld from them.
Read again, it says God is the Savior of ALL people and especially those who believe. All people, those who believe.
Those for whom He is the Saviour, cannot be more than those the Father gave to Him, all of which MUST become saved (per the below verse). Conversely, those not given to Christ by the Father, can NEVER become saved, because they were NOT given by the Father.
Those who have already become saved are the "especially" group; He is the Saviour also of those yet to be saved, the elect - they have been elected to salvation but are not yet made of the "especially" group.
Look at it this way, if Christ is in fact the Saviour of all men and yet some don't become saved, then without question, He simply
cannot have been their Saviour: the Saviour MUST save completely, in and of Himself, period.
[Jhn 6:37 KJV] 37
All that the Father giveth me shall come to me; and him that cometh to me
I will in no wise cast out.
No. He is the sacrifice for our sins, here and now, and the sins of the whole world. Not future, that would not make sense in the sentence. It is speaking in the moment.
It is the world to come. Had Christ not been successful in His ministry and justified His saved, then a world to come would not have been possible because without those who are to inhabit it, there could be no world to come.
There is no interpretation needed. It is very clear in what it is saying. ALL means all and no Scripture does not go against itself. Very clear what it is saying.
So, you're saying the Bible is wrong about itself and that you are really its true judge? Really? That is pretty arrogant and just flat wrong. The Bible never goes against itself, but it does complete itself - that is why there is both an OT and a NT.