Of course, this question assumes that married couples are happy. In reality, there are plenty of miserable married people out there!
In the garden, God said, “It is not good for man to be alone”. Adam was truly alone as he was the only human being in existence, not just that he did not have a wife. God provided a companion for Adam and they gave birth to the human race. It is not good for man to be in a state of chronic loneliness, but God never said, “It is not good for a man to be unmarried”. 1 Corinthians 7:1 says that it is, “good to live a celibate life” (literally “good for a man not to touch a woman”). The first Adam was married, but the second Adam, Jesus, was not. Neither was Daniel, Elijah, Elisha, Jeremiah, Anna, John the Baptist or Paul.
Marriage is God's primary means of providing human companionship but it is not the only way. Singles can invest time in deep friendships and invest quality time with God without family distractions. Jesus, Paul and Daniel had long times of prayer and also invested time with their companions and in serving their community. Single people can have more leisure time and don't have to endure domestic strife, although sometimes they do miss that deep intimacy of marriage. There are benefits both ways and life is what we make it.
For Christians with same-sex attraction, both singleness and heterosexual marriage are good options to pursue and there is nothing wrong with desiring (and not desiring) marriage. If we feel we have been pressured into marriage or consigned into staying single then we can become resentful. If we see our status as our choice, and God's best, then we can be content. By delighting ourselves in the Lord, our happiness will be in God's will for us. We are unique, and God knows what is best for us. True joy comes from walking with Jesus and is a fruit of the Spirit (Gal 5:22). The Bible talks about a, “joy unspeakable full of glory” (1 Peter 1:8) in the midst of trials and troubles. A disobedient believer who complains to God over his single status will not know happiness (the author speaks from experience). The old chorus goes, “There is no other way to be happy in Jesus than to trust and obey”. This deepest joy can be experienced by all faithful believers, married or single.
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