God instituted marriage (Gen 1: 21-25) to eliminate solitude (Gen 2:18), and for the only proper relationship for sexual intimacy and procreation (Gen 1:28; 1 Cor 7: 1-5).
According to Scripture, there simply is no such thing as homosexual marriage, and Christians should avoid speaking as if there is. Speaking of homosexual marriage does not legitimize homosexual relationships; rather, it vulgarizes the term marriage. If marriage were other than a heterosexual relationship, marriage would not exist because humans would not exist.
“Wives, be subject to your own husbands, as to the Lord. For the husband is the head of the wife, as Christ also is the head of the church, He Himself being the Savior of the body. But as the church is subject to Christ, so also the wives ought to be to their husbands in everything. Husbands, love your wives, just as Christ also loved the church and gave Himself up for her” (Eph 5:22-25).