So does murder.
It meets the basic criteria for self-hatred and self-degradation.
Yes, it does. Only a broken psyche would engage in behavior that was antihuman, antifamily, and against the created order. Just because culture is blind to the malady doesn't mean it doesn't exist.
They engage in sexual activity with the wrong sex. The commonality lies there.
Human beings have freedom of the will. Thus, sexual practice is not biologically determined.
Homosexuality is a behavior pattern performed habitually over time, a pattern of behavior violating the created order. Any scientific paper suggesting that homosexuality has genetic markers is suspect.
Orientation is just the direction we point the ship when looking for a safe harbor. Some feel safer with their own kind.
Variation is irrelevant. Hammers are made for nails; screwdrivers are made for screws; bats are made for balls; golf clubs are made for golf balls; eyeglasses are made for eyes; shoes are made for feet; nuts are made for bolts; legs are made for tables; keys are made for locks and laughter is made for children.
Design, design, design, design.