If you're a believer in God and his Word as His perfect revelation, then you believe that God created man and woman to enter into the legal status of marriage, and for two opposite sexes alone to perform sexual activities (only inside the marriage relationship). This is natural. If God had not directly prohibited such activities (as He does in Romans 1:26-27 and 1 Corinthians 6:9-10), then there would not be such profound intolerance to homosexual relationships.
However, God has made it clear that He wants humans to restrain themselves from homosexuality. I don't consider myself worthy to question the all-knowing creator of the universe. You might feel differently.
Obviously if you don't believe in God, a "God made it this way" argument won't satisfy the question for you. But that's why I'm on a religious forum that discusses religious beliefs and doesn't solely question the existence of God.
On the oe hand we have peer reviewed sciences stating, unequivocally, that homosexuality is an inherent and natural part of humanity, unchangeable in those among the human community who are, indeed, homosexuals.
On the other hand is a collection of two thousand year old writings that claim there is enough water on this flat, geocentric, 6,000 year old planet to completely inundate the surface so that some 700 (or 900) year old guy can somehow shoehorn millions of animals, birds, fish and insects, enough food (including raw meat) for over a year, and tons of plant seeds onto one wooden craft so that said "loving" god can drown everything else from kids to kittens.
Sorry, but even if one does believe in Jehovah the Creator Deity, any rational mind should see that to oppress and persecute an entire minority merely on the word of what amounts to nothing better than a poorly written fiction is simply asinine.
And that is ignoring, for the moment, that your Christ figure never once stated anything negative about homosexuals in said fiction.