Hi. I've been asking this question in different threads at this forum, so far two answers received are "I don't know" or "we're not supposed to know".
Jesus in John 14:6 says He is the only way to the Father.
The people who have never heard about Jesus or never heard a proper gospel about Jesus - are they all going to hell? They have no faith in Jesus.
There may be many ways to Jesus, but only one way to the Father, through him... Is is impossible to get to the real, true Father God, only a false one, except through him alone... You cannot know the real, true Father without first knowing Jesus... For he who sees (knows) Jesus only when you or they, fully comprehend, and know, that is, to "see" Jesus, will you, or the only way to see and know the true Father God is by knowing him... There is no other way...
God is Godly Love, the Father, Jesus, and the Holy Spirit are God, and they are Godly Love, those who know Godly Love, Know God, know them, ONLY by and through Christ can you or they know this, there is no other way... If people say there are many ways to God, it is right that there may be many ways to God, but only because Christ is God, they can never find and will never know God if they do not know him... There may be many ways to discover Godly Love, but in the end Godly Love, which is God, is Christ...
Those who suffered greatly with, for, or because of Christ, because of believing in Christ, and were faithful and true and good regardless, will take part in the first resurrection and be part of the thousand year reign or age of Christ, which will be Paradise, not Heaven yet, but Paradise, like in the Garden of Eden, or the 3rd heaven... When that is over, the rest, "all" of them, "all" the rest of the dead, regardless of their beliefs, will take part in the second resurrection and be judged according to their deeds, which those of the first resurrection are not judged by, because they were and had been already...
Anyways, the dead, "all" of them will be resurrected, and judged according to their deeds, and their life will be weighed on his balance scales of justice, and whomever is judged worthy of eternal life, will get eternal life, those deserving of eternal death, eternal death... Those who's names were written in the Book of Life, will be those who make it during the second resurrection... And those ones will, at that time, join those who lived the earthly thousand year reign of Christ, and those two groups will, at that time, go to be in Heaven... Leaving the earthly paradise behind, because a new heaven and a new earth are made at that time, and the old ones are done away with, and perhaps their will be some new humans to inhabit a new Garden of Eden, when, after the first resurrection, the second one comes, and both those who were a part of the first, and those who made it in the second, will go to the heavenly realm and be spirits...
God Bless!