Hi, I have a question for anyone who knows the Mormon teaching…
why is being married necessary for “eternal progression”??
I dont understand… what if a person really loved God but never married? (such as those in religious orders

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I personally don’t like to use the term “eternal progression”. It is not a scriptural term, and it can complicate the theology of salvation in Mormonism. I would rather just call it exaltation in the celestial kingdom of God. So your question is: Why marriage is necessary for exaltation in the celestial kingdom? The requirement for exaltation in the celestial kingdom are described in section 76 of the Doctrine and Covenants as follows:
D&C 76:
50 And again we bear record—for we saw and heard, and this is the testimony of the gospel of Christ concerning them who shall come forth in the resurrection of the just—
51 They are they who received the testimony of Jesus, and believed on his name and were baptized after the manner of his burial, being buried in the water in his name, and this according to the commandment which he has given—
52 That by keeping the commandments they might be washed and cleansed from all their sins, and receive the Holy Spirit by the laying on of the hands of him who is ordained and sealed unto this power;
53 And who overcome by faith, and are sealed by the Holy Spirit of promise, which the Father sheds forth upon all those who are just and true.
54 They are they who are the church of the Firstborn.
55 They are they into whose hands the Father has given all things—
56 They are they who are priests and kings, who have received of his fulness, and of his glory;
57 And are priests of the Most High, after the order of Melchizedek, which was after the order of Enoch, which was after the order of the Only Begotten Son.
58 Wherefore, as it is written, they are gods, even the sons of God—
59 Wherefore, all things are theirs, whether life or death, or things present, or things to come, all are theirs and they are Christ’s, and Christ is God’s.
60 And they shall overcome all things.
61 Wherefore, let no man glory in man, but rather let him glory in God, who shall subdue all enemies under his feet.
62 These shall dwell in the presence of God and his Christ forever and ever.
One of the requirements of obtaining this exaltation is that they should comply with all the commandments of God, which includes all the ordinances (sacraments) of the gospel. In the LDS Church, those sacraments are more numerous than in the Catholic Church. They include ordination to the priesthood for example, which is not required in Catholic theology. In Mormonism, marriage for eternity (not just ordinary marriage) is one of those essential sacraments required for exaltation. Just as baptism is necessary, and confirmation is necessary, and priesthood ordination is necessary, so is marriage for eternity. God has decreed it that way, as Paul said: “Nevertheless neither is the man without the woman, neither the woman without the man, in the Lord” (1 Corinthians 11:11). In Mormonism marriage for eternity is a proper sacrament that can only be performed by the authority of the priesthood. In fact, it is so sacred that it can only be performed in our temples. It is not the same thing as ordinary civil marriage. Also, in Mormonism there are three levels or degrees in the celestial kingdom. Marriage for eternity is required for entrance in the highest level or degree.
also, do only Mormons get to be in the ‘celestial’ heavenly kingdom?
Non-Mormons can obtain exaltation provided they fulfill the conditions spelled out in these verses:
D&C 137:
7 Thus came the voice of the Lord unto me, saying: All who have died without a knowledge of this gospel, who would have received it if they had been permitted to tarry, shall be heirs of the celestial kingdom of God;
8 Also all that shall die henceforth without a knowledge of it, who would have received it with all their hearts, shall be heirs of that kingdom;
9 For I, the Lord, will judge all men according to their works, according to the desire of their hearts.
10 And I also beheld that all children who die before they arrive at the years of accountability are saved in the celestial kingdom of heaven.