Why do Christians harp on homosexuality when Jesus never mentioned it?

Genesis 1:27, 2:24
Leviticus 18
Matthew 5, 19, 19:6
John 3
Romans 1
2 Timothy 3:16
Revelation 22:15

Jesus did address it — numerous times in fact. For instance, in Matthew 5 and 19, Jesus addresses the issue of marriage. While doing so, He does something “radical” that many Christians are unwilling to do today. He quoted the Bible as the authority! He defines marriage by quoting Genesis 1:27 and 2:24, rooting His understanding of marriage in the history and biology of Genesis.

Here, marriage is defined as one man and one woman for the purposes of procreation, sanctification, and illustration. He states
that what God has joined in marriage, let no man separate (Matthew 19:6). The point? God established and defines marriage, not man. Marriage is God’s institution and man has no right or authority to redefine it in any way. By definition, same-sex “marriage” is not marriage. It’s an arbitrary man-made concept that goes directly against what God created in Genesis and what Jesus unreservedly affirmed and proclaimed.

Some suggest that Jesus’ lack of stating the word homosexuality during His earthly ministry implies acceptance. However, that’s
illogical and leads to huge problems. For example, Jesus never mentioned pedophilia by name either. Does He accept that? Of
course not!

More significantly, Jesus is God. He is a member of the Trinity, the singular being of God existing eternally in three persons — the Father, Son, and Holy Spirit. As such, Jesus is the ultimate author of all Scripture, not just the “red letters.” He’s the author of Leviticus 18 and Romans 1. Jesus was there, executing righteous judgment on Sodom and Gomorrah. All of Scripture is “God-breathed” (2 Timothy 3:16; NIV). When any Scripture speaks, Jesus speaks. And there are hundreds of Bible verses that deal directly with sexuality, marriage, and sexual purity.

It must also be stated that the Bible is one book. It’s one book, composed of smaller books, with one fundamental author, God. These books are supernaturally unified in truth, theme, and focus and cannot be divided one from the other. Every verse of Scripture is eventually to be understood in the grand context of the Bible’s singular meta-narrative. That narrative, from one end of the Bible to the other, points to Jesus Christ. In reality, all of history is “His-story”! It’s often said like this: the best commentary on the Bible is the Bible. This makes sense because it’s the absolute authority. Understanding this means Leviticus 18 cannot be separated or isolated from John 3. The teaching of Christ cannot be separated from the Apostles’ teaching. The Apostles were Christ’s Apostles; their teaching is the authoritative teaching of the church from King Jesus.

As God, Jesus dealt with homosexuality directly and indirectly. In His perfect, indivisible Word, homosexuality is plainly addressed in the larger, unified context of revealing the one who can save us from our sins and the final judgment (Revelation 22:15).