John 10:16 16 I have other sheep that are not of this sheep pen. I must bring them also. They too will listen to my voice, and there shall be one flock and one shepherd.
Let's examine the timeline. Jesus was still here, alive on Earth when he spoke these words. He says they (other sheep) will become one flock with the "sheep" he is currently talking to (Jews). He will be the "one shepherd" to this "one flock".
Ephesians 2:11-22 11 Therefore, remember that formerly you who are Gentiles by birth and called “uncircumcised” by those who call themselves “the circumcision” (which is done in the body by human hands)— 12 remember that at that time you were separate from Christ, excluded from citizenship in Israel and foreigners to the covenants of the promise, without hope and without God in the world. 13 But now in Christ Jesus you who once were far away have been brought near by the blood of Christ.
14 For he himself is our peace, who has made the two groups one and has destroyed the barrier, the dividing wall of hostility, 15 by setting aside in his flesh the law with its commands and regulations. His purpose was to create in himself one new humanity out of the two, thus making peace, 16 and in one body to reconcile both of them to God through the cross, by which he put to death their hostility. 17 He came and preached peace to you who were far away and peace to those who were near. 18 For through him we both have access to the Father by one Spirit.
19 Consequently, you are no longer foreigners and strangers, but fellow citizens with God’s people and also members of his household, 20 built on the foundation of the apostles and prophets, with Christ Jesus himself as the chief cornerstone. 21 In him the whole building is joined together and rises to become a holy temple in the Lord. 22 And in him you too are being built together to become a dwelling in which God lives by his Spirit.
v 14 says, "who has made the two groups one". It doesn't get much clearer than this.
Ephesians 4:4-6 4 There is one body and one Spirit, just as you were called to one hope when you were called; 5 one Lord, one faith, one baptism; 6 one God and Father of all, who is over all and through all and in all.
One hope. For Christians. Perhaps the 144,000 can be interpreted another way?
2. The issue Satan raised was on earth, and every one abandoming earth, is not the way to settle the issue, in fact Jesus settled it in the flesh, and when Satan is released he will be tempting flesh for heaven is incorruptible in Jesus Kingdom 144000 immortals, and heaven is death free.
No one said everyone abandons Earth. But it seems to me that giving a select few immortality, when we are all sinful, doesn't sound fair.
Especially to those Christians that have to suffer every bit as much as supposed "anointed" have had to suffer.
Maybe the New Covenant is simply "off limits" to those that never got to participate i.e., Jews, people that never heard the Gospel, etc.? That would sure fill up a lot of the Earth, wouldn't it?
As for Hebrews 5:9, ...he became responsible for everlasting salvation to all those obeying him...
Really? It says, "to all those obeying him". So Christians don't have to obey Christ while here on Earth to obtain their crown? First I heard of that. And it's the first time I hear of such a grand misapplication of scripture. Honestly.
And Romans 8:19-25 certainly does distinguish two groups, yet you have not one shred of evidence to indicate it is speak of two "Christian" groups. The "creation" may well be those that didn't participate of the "New Covenant". It fits quite well.