OK, do you understand that those who worship the Father as Christians are divided into two groups?
Rev 7 talks about the '144,000' as well as a 'great multitude'.
Two groups. One finite (a pre-determined number) and one infinite. (no pre-determined number)
The 144,000 are "bought from the earth". (Rev 14:1-4) These are the "chosen ones"; "firstfruits", who will go to heaven to rule as "kings and priests" with Jesus. (Rev 20:6) These are resurrected "first" and these alone inherit immortality. All of the first Christians were part of that group. It was TO these and FOR these that the Christian scriptures were written. They all had the desire to go to heaven implanted in their hearts by holy spirit. Once the ranks of the 144,000 were filled, then the great multitude began to be gathered. All owe their salvation to God and the Lamb.
The "great multitude" are said to "come out of the great tribulation", which occurs on earth as the finale of things in the present age. (Matt 24:21,22) Some of the "chosen ones" will still be on earth at that time because the last days must be cut short on their account...otherwise "no flesh would be saved".
The 'great multitude' are pictured as attributing salvation to God and "washing their robes in the blood of the Lamb", (making them Christians) but they are not part of the '144,000' heavenly rulers. These will be subjects of these rulers and will be joined later by those who come back in the general resurrection. (John 5:28, 29)
'Immortality' is not the same as 'everlasting life' for a very important reason. Immortal beings CANNOT die. This state of being is only granted to the 144,000 who are 'spiritual Jews'.
Jesus was in every respect, a mortal human who could, theoretically, have lived forever in the flesh but he willingly gave up his perfect life to rescue Adam's children from sin and its wages, death. It was not their choice to be born in sin. The choice we have is NOT to allow sin to gain the mastery over us. We can control what we do. We can choose NOT to deliberately sin, but if we are overtaken by a moment of weakness, we can be 'covered' by Jesus' sacrifice. This is NOT something we can take for granted nor is it a provision that we can abuse. If there is no repentance, there can be no forgiveness.
Humans were designed to live forever in the flesh but they were always going to be mortal. The 'tree of life' that was also in the garden guaranteed that. (Gen 3:22) Access to this tree was only denied after they disobeyed. God went to great lengths to ensure that they never gained access to it again. (Gen 3:24)
Those who go to heaven, leave their mortal bodies behind. Flesh and blood cannot live in heaven.
As I understand it, "everlasting life" is not the same as "eternal life". It is ongoing life granted by God on the basis of continued obedience....as Adam would have enjoyed with his children if he had remained faithful and obeyed God's commands.
The word 'eternal' has the meaning of forever in both directions. Only the Father is truly eternal. 'Everlasting', on the other hand has the meaning of going on in a continuum...never ending even though it has a beginning.
As long as humans obey God, there is no reason for them to die. There was no reason for Adam and his wife to die. It was a penalty imposed for their disobedience.
Look at this beautiful planet! It was designed to be our permanent home. We were appointed to be its caretakers, zookeepers and landscape gardeners. That is what I look forward to! What a wonderful future for faithful ones.
