I answer that the reason why marriage is only between one man and one woman is because the Holy One of Israel hath spoken it. In Genesis 2:24-25, we read, "Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh. And they were both naked, the man and his wife, and were not ashamed." Our dearly beloved Brother Paul also hath said, "For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature: And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet" (Romans 1:26-27).
The above scriptures agree with the teachings of The Church of Jesus Christ of Latter-day Saints that homosexual relations are grevious sins. Well did President Boyd K. Packer state,
We teach a standard of moral conduct that will protect us from Satan’s many substitutes or counterfeits for marriage. We must understand that any persuasion to enter into any relationship that is not in harmony with the principles of the gospel must be wrong. . . . there are those today who not only tolerate but advocate voting to change laws that would legalize immorality, as if a vote would somehow alter the designs of God’s laws and nature. A law against nature would be impossible to enforce. ("Cleansing the Inner Vessel", Ensign, November 2010)
Sister Gallagher stated in her article also that "Gay marriage is not an increase in liberty; it is a government takeover of an institution [marriage] that government did not create and should not redefine.
When the government endorses a lie about human nature, there will be consequences."
I say also that there will be consequences when finally the United States sinks into this debouchary known as gay marriage. The Mormon Eagle warns that unless the Fulness of the Gospel as taught by The Church of Jesus Christ of Latter-day Saints is followed in a strict and saintly manner by the people of the United States, God will stand aloof from this nation because of our choice to disregard His words. He will then cease to protect and help us, for He hath said through His servant Moroni,
And now, we can behold the decrees of God concerning this land, that it is a land of promise; and whatsoever nation shall possess it shall serve God, or they shall b swept off when the fulness of his wrath shall come upon them. And the fulness of his wrath cometh upon them when they are ripened in iniquity. . . . Behold, this is a choice land, and whatsoever nation shall possess it shall be free from bondage, and from captivity, and from all other nations under heaven, if they will but serve the God of the land, who is Jesus Christ, who hath been manifested by the things which we have written. (Ether 2:9, 12)
In the name of Jesus Christ, amen.