Incidentally, in connection with the "Jerusalem above," the seed of Abraham, and the New Covenant:
The Society's position is that Jesus and the 144,000 are "Abraham's Seed" and that the nations bless themselves by means of that seed. That is, the nations do not become part of that seed, nor are they included in the New Covenant (and thus, the "Jerusalem above" is not their "mother"), rather, they get blessings by associating with that seed of Abraham.
Paul saw things a bit differently. According to him, Jesus is the 'seed of Abraham.' Galatians 3:16 (NWT) says: "...Now the promises were spoken to Abraham and to his seed. It says, not: "And to seeds," as in the case of many such, but as in the case of one: "And to your seed," who is Christ."
From there, Paul reasoned:
". . .YOU [the Gentile Galatian Christians] are all, in fact, sons of God [as part of being in the New Covenant] through YOUR faith in Christ Jesus. 27 For all of YOU who were baptized into Christ have put on Christ. 28 There is neither Jew nor Greek, there is neither slave nor freeman, there is neither male nor female; for YOU are all one [person] in union with Christ Jesus. 29 Moreover, if YOU belong to Christ, YOU are really Abraham's seed, heirs with reference to a promise. (Galatians 3:26-29 NWT)
Thus, Paul's reasoning was that 'the nations bless themselves' by putting faith in Jesus, as the seed of Abraham. And then they become part of Abraham's seed thru their faith in Christ.
From here, there are some very interesting links with Paul's argument and what Revelation chapter 7 says about the great crowd:
First, the "great crowd" is described numerically and by origin, ". . . which no man was able to number, out of all nations and tribes and peoples and tongues. . ." (Revelation 7:9)
This description provides two links to the promises made to Abraham. Genesis 13:16 and 15:5 both promise that Abraham's seed would become an innumerable multitude. And the multinational character of the great crowd fits the description of the promise in Genesis 22:18 of 'all nations blessing themselves.'
Secondly, the great crowd's 'washing their robes in the blood of the Lamb' fits Paul's description of becoming part of Abraham's seed thru faith in Christ.
Thirdly, the description in Revelation 7:16 that the great crowd "will hunger no more nor thirst anymore, neither will the sun beat down upon them nor any scorching heat . . ." is drawn from Isaiah 49:10. In the immediate context of that verse (Isa 49:8-10) God's Servant is said to be given as "a covenant for the people." The people are then described as "repossessing . . . the desolated hereditary possessions," and 'not suffering from hunger, thirst, etc, as is quoted in Revelation 7:16. All this speaks of a "people" who are part of a covenant, "repossessing," not merely bystanders hoping to benefit by hanging around others in the covenant.
These things clearly indicate that the "great crowd" are part of Abraham's seed, and part of the New Covenant, and that their "mother" is NOT some earthly organization, but the "Jerusalem above," just as described by Paul in Galatians.
And this connects the great crowd with what Paul said in Galatians 3:14 (NWT): ". . .The purpose was that the blessing of Abraham might come to be by means of Jesus Christ for the nations, that we might receive the promised spirit through our faith." Thus, the great crowd are also included among 'spirit anointed' Christians and would be expected partakers at the Lord's Evening Meal celebration.