You're not hurting anybody by being homosexual. Other people will try to hurt you, though, for no particular reason. Also, there is no scientific evidence as brain damage or abnormalities causing homosexuality. I don't even understand the conclusion of "Animals do it, that must mean it's a disease, and that means when humans do it, it's a brain disease too!".
On a related topic, I eat relatively kosher (no unkosher meats, no shellfish, no bugs, no meat and milk, and basically eat mostly fruits and vegetables and occasional fish, with the rare kosher meat here and there). I do so because I believe the tradition of Kosher is an important one, a symbolical control of the body, and also to avoid the diseases that are caused by those foods. I don't believe there is any merit in persecuting people because they are different.
If you follow the Bible in a literal fashion, go burn your polyester clothes (no cloth of two fabrics), get fringes on all your clothing, do not work, drive, or turn on appliances during the Sabbath (which is on SATURDAY). Eat kosher, IE, separate refrigerators for meat and milk products, which must all be kosher. Kosher dish-ware with designated milchig (Milk), and fleshig (Meats), and no cross use of these can be allowed. Pareve (neutral food items like fish, eggs, vegetables, fruits, and grain products) can be eaten along with meat or milk, but if Pareve dish-ware touches milchig or fleshig, it then becomes strictly for that food.
Also, you must wear prayer boxes (tefillin) during prayer, on the arms and heads. You must fast of Yom Kippur, from sundown before to Sundown after. You must construct a Sukkah during the Holiday of Sukkot, with an organic roof that allows you to see the sky. You must eat meals in there, and also must shake the Four Species (Etrog, a type of Citron, A bough of a Myrtle Tree, A Willow Branch, and a Date Palm frond) in a specific manner... etc. etc. etc.
And before you bring the old New Testament wiped out the old Testament, remember: "Do not think that I came to abolish the Law or the Prophets; I did not come to abolish but to fulfill. " - Yeshua Ben Yoseph (also known as Jesus Christ) - Matthew 5:17
None.