Every Christian denomination believes in the "144,000 thing", since it is a part of our Bible, in the Revelation to John. It seems there are just many interpretations of it depending on your particular eschatological belief. The (partial) LDS official position is on their website:
"As we look toward our common future, we see that, as foretold, the great gathering, or restoration, of all the peoples of Israel who have spread themselves throughout the world will be accomplished and distinct remnants of all of the tribal units of Israel will at last be united again in fellowship under Christ. All tribes are to have representation in the establishment of the New Jerusalem. All tribes will have representatives in the calling of the “hundred and forty and four thousand” mentioned in John’s revelation, twelve thousand out of every tribe of Israel. (
Rev. 7:2–8.) These are “high priests, ordained unto the holy order of God, to administer the everlasting gospel; for they are they who are ordained out of every nation, kindred, tongue, and people, by the angels to whom is given power over the nations of the earth, to bring as many as will come to the church of the Firstborn.” (
D&C 77:11.) Thus, a great work awaits representatives of each tribe as they continue to preach the gospel throughout the world to all mankind. Ultimately, in righteousness the Other Tribes of Israel will be prepared to return to Jerusalem, to receive with Judah the lands of their first inheritance. (See
Deut. 30:1–5.)"
Israel’s ‘Other Tribes’
Edit: moo.