I fully believe 144,000 will be saved and sealed and added to the Church, the Church is the Israel of God, not those of ethnic Israel, (Dual Covenant Theology) is a false teaching
There is one covenant between God and man, the shed blood upon Calvary
Roman's 9:6-8KJV
6 Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:
7 Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
8 That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.
The Church represents the twelve tribes
James 1:1KJV
James, a servant of God and of the Lord Jesus Christ, to the twelve tribes which are scattered abroad, greeting.
There is one covenant between God and man, the shed blood upon Calvary
Roman's 9:6-8KJV
6 Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:
7 Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
8 That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.
The Church represents the twelve tribes
James 1:1KJV
James, a servant of God and of the Lord Jesus Christ, to the twelve tribes which are scattered abroad, greeting.
This makes no sense.
James Adressed his Letter to the jews which turned to Christ and called them the 12 tribes. Can be an answer to you.