Well, since every human is a "potential Christian".. this is questionable.
Either way.... 144,000 of these Jewish people... will be converted and come to believe in Christ being their messiah.
So, it is entirely possible that you are incorrect as this being the "unpardonable sin"
From what I understand the unforgivable sin is the blasphemy of the Holy Spirit.. I don't think that, incorrectly doing live sacrifices is going to be the same.
You might be better off if you spend some time with this.
144,000
The community of the “redeemed” in 7:3–8 is the same as in 14:1–4 because of the verbal parallels and ideas observed above. In 14:3–4, the 144,000 are those “who had been purchased from the earth” and who “have been purchased from among men as first fruits to God.” And there is a parallel between 14:4 and 5:9b which is so close that the groups mentioned as “purchased” in both are probably identical (5:9b: the lamb purchased “for God … men from every tribe and tongue and people and nation”). This would mean that the 144,000 in 14:1–3 are not some small remnant of ethnic Israelites but another way of speaking of the larger remnant of humanity living during the church age whom Christ has redeemed from throughout the world. If this identification is correct, then the 144,000 in 7:3–8 must also represent the same redeemed remnant from all over the earth. In this case, 7:9 would interpret the group of 7:3–8 as those who are “from every nation and all tribes and peoples and tongues” (see further on 7:9). This is virtually the same phrase as that in 5:9b, both being based on the formulas of Daniel 3–7. This group is numbered as 144,000 to emphasize figuratively that this is a picture of the church in its entirety, not in part, which has been redeemed, as the vision of the multitude in 7:9–17 bears out (on the identity of the 144,000 see further on vv. 4–8 below).
That this is the case is apparent from the following reasons, among other considerations
Who are the one hundred and forty-four thousand? They are unlikely to be literal Israelites living at the very end of history during a severe tribulation, nor are they literal Israelites living during the desecration of Israel’s second temple in the first century, for in either case God’s protection would apply only to ethnic Jews—and a limited number of them—rather than to His people redeemed from every nation, including Jewish believers in Jesus. Such a suggestion would be alien to the teaching of the NT (read Galatians, for instance).
A better understanding comes from the context. In 5:9, the Lamb is said to have purchased with His blood “men from every tribe and tongue and people and nation.” In 14:3–4, the 144,000 are said to have been purchased “from the earth” and purchased “from among men.” The almost identical language suggests that the two are the same group—the church of all ages. This would explain why, immediately after the vision of the sealing, John sees a great multitude of people from every nation and tribe and people and tongue (7:9). As we will see, this is a picture interpreting the number which has been heard in 7:4–8, thus representing those who have been sealed. As noted above, all Satan’s followers bear his mark or name, and all the Lamb’s followers must bear the Lamb’s mark or name—hence, all believers in Christ throughout the ages are sealed and must be included in the one hundred and forty-four thousand.
But why speak of a specific number? In 21:13–14, the twelve tribes and the twelve apostles together form the foundational structure of the new Jerusalem. Multiplying twelve by twelve equals one hundred and forty-four, representing the entire people of God through the ages. Multiplying that figure by one thousand reinforces the notion of completeness.
In the list of tribes recorded in these verses, it is striking that Judah is mentioned first. This emphasizes Christ’s descent from Judah (see 5:5), as prophesied in Gen. 49:8–10 and elsewhere in the OT where a descendent of David (and thus of Judah) is prophesied to arise as Messiah in the latter days (Ezek. 34:23; 37:24–26; Ps. 16:8–11; together with Acts 2:25–28). Therefore, this is a continuation of 5:5, where Jesus is identified as the fulfillment of the promised leader from Judah. Furthermore, the priority of Judah is appropriate because Gen. 49:10 predicts that the coming leader of Judah will bring about “the obedience of the peoples.” In this respect, the LXX of Gen. 49:10 reads, “he is the expectation of nations,” and Paul alludes to Gen. 49:10 in Rom. 1:5 by referring to “the obedience of faith among all the Gentiles,” which has been accomplished by Christ, the “descendant of David according to the flesh” (Rom. 1:3; cf. 16:26). Therefore, the tribe of Judah is mentioned first because the Messiah from Judah is the king who represents Israel, and through its new king Judah has become the door of blessing to the nations (so 5:5, 9). Accordingly, a kingly descendant from David would be a natural choice to provide entry for the nations into the blessings of Israel.
It is clear that one of the names written on Gentile Christians, in addition to those of God and Christ, is “the name of the city of my God, the new Jerusalem” (3:12). Since the name of the “new Jerusalem” is equated with Christ’s “new name” in Rev. 3:12, it is likely that Christians can be identified with the “new Jerusalem,” since they are identified with Christ; they are thus the true Israel. In the same way, Isa. 49:3, in relation to Isa. 53:10 and Gal. 3:16, affirms the Messiah as the true Israel. Jesus as the messianic “seed” of Israel (Gal. 3:16) represents all believers, so that they are also part of the Israelite “seed” (Gal. 3:29). However, this name is not written on those “who say that they are Jews, and are not” true Jews (Rev. 3:9), since they reject Christ. The name of “the new Jerusalem” applied to the church of Philadelphia is closely linked conceptually to the 144,000 from every tribe of the sons of Israel.
Christians are thus here portrayed as the true Israel, as also in 1:6 and 5:10 (applying Exod. 19:6); 5:9 (applying Dan. 7:18, 22); 2:17 and 3:12 (applying Isa. 62:2 and 65:15); 3:9 (applying Isa. 49:23 and 60:14); and in the picture of the new Jerusalem in chs. 21–22 (applying Ezekiel 40–48). In fact, a series of prophecies about Israel’s restoration is cited as fulfilled in those who believe “from every nation and all tribes and peoples and tongues” in 7:9, 15–17 (on which see below). This is consistent with the identification elsewhere in the NT of the church (composed of Jews and Gentiles) as fulfilling predictions of Israel’s restoration (so Rom. 9:24–26; 10:12–13; 2 Cor. 5:17; 6:2, 16–18) and being called true “Jews” (Rom. 2:28–29), “Israel” (Rom. 9:6; Gal. 6:15–16), true “circumcision” (Phil. 3:3), “the twelve tribes” (cf. Jas. 1:1), or dispersed Israelites (1 Pet. 1:1; 2:9). In fact, including Gentiles as part of true end-time Israel was prophesied in the OT (so Psalm 87; Isa. 19:18–25, especially v. 18; 56:1–8; Ezek. 47:21–23; Zech. 2:11; 9:7).
Beale, G. K., & Campbell, D. H. (2015). Revelation: A Shorter Commentary (pp. 149–150). Grand Rapids, MI; Cambridge, U.K.: William B. Eerdmans Publishing Company.