The apostle's words are playing out openly in our daily news as marriage loses its traditional value in this society. In this passage, Paul describes the current generation—how men have rejected God's will and supplanted it with gross idolatry and how they have become lovers of themselves, exalting the creation and their desires above the Creator. With this foundation and with God allowing mankind to pursue its own course for the present, human nature desires to remake all of God's institutions in its own image, and the marriage covenant is in its cross-hairs.
Marriage and family are the foundations of any healthy society, and these two bedrocks of civilization are slowly being dismantled before our eyes. When these foundations, which God formed in righteousness, are weakened further, it will prepare for a different foundation—one formed in unrighteousness to support the coming of the lawless one, the son of perdition, as II Thessalonians 2:3-10 foretells.
Marriage and family were undefiled when God gave them as a gift to mankind before sin entered the world. In Genesis 2:18, God enacted the first social foundation for mankind: "And the LORD God said, 'It is not good that man should be alone; I will make him a helper comparable to him.'" Then, in verse 24, God sanctifies Adam's relationship with Eve by declaring that the two would be joined together as one flesh, that a man and his wife should leave mother and father, cling to each other, and become their own family unit. In other words, marriage was dignified and defined by God as a joining of one man and one woman.
Why did God do it this way? He could have just kept on creating one man after another to populate the earth. It was unlikely that He would run out of the dust of the earth. However, He made them male and female for a reason.
The prophet Malachi reveals a major reason why God created man and woman to become one flesh. The answer is part of God's castigation of Judah for tolerating easy divorce laws. In Malachi 2:11, He says that by doing so, the Jews had profaned the holy institution of marriage that God so dearly loves.
Yet you say, "For what reason [are you angry]?" Because the LORD has been witness between you and the wife of your youth, with whom you have dealt treacherously; yet she is your companion and your wife by covenant. But did He not make them one, having a remnant of the Spirit? And why one? He seeks godly offspring. Therefore take heed to your spirit, and let none deal treacherously with the wife of his youth. "For the LORD God of Israel says that He hates divorce, for it covers one's garment with violence," says the LORD of hosts. (verses 14-16)
Because He wants godly children, God made humans male and female. Within the structure of a proper, married family life, strong in unity and free from worries of separation, it would produce the best results.
From this comes a second reason why God made them male and female. With the blessing of children, God has bestowed on mankind the gift of allowing parents to become His partners in His creative works by rearing children who are prepared to answer His calling. This spiritual reproductive process will one day bring many sons and daughters into God's Family. This realization places families and marriage far above what most in the world consider them to be. It elevates them to a moral level unrecognizable in this world of sin.
The wisdom and depths of love that God has for mankind are beyond our abilities to know fully, but it is clear that marriage and family are prominent in God's plan. Any changes to the divine structure are an affront to God and His plan. Marriage is of divine origin, and changes to it are nothing less than man's rebellion against his Creator.