Homosexuality violates natural moral law, it doesn't have to be from a biblical view. ( I believe some religions use Natural law to come to their conclusions)
As the professor from Illinois that got fired laid out,
"But the more significant problem has to do with the fact that the consent criterion is not related in any way to the NATURE of the act itself. This is where Natural Moral Law (NML) objects. NML says that Morality must be a response to REALITY. In other words, sexual acts are only appropriate for people who are complementary, not the same. How do we know this? By looking at REALITY. Men and women are complementary in their anatomy, physiology, and psychology. Men and women are not interchangeable. So, a moral sexual act has to be between persons that are fitted for that act. Consent is important but there is more than consent needed.
One example applicable to homosexual acts illustrates the problem. To the best of my knowledge, in a sexual relationship between two men, one of them tends to act as the “woman” while the other acts as the “man.” In this scenario, homosexual men have been known to engage in certain types of actions for which their bodies are not fitted. I don’t want to be too graphic so I won’t go into details but a physician has told me that these acts are deleterious to the health of one or possibly both of the men. Yet, if the morality of the act is judged only by mutual consent, then there are clearly homosexual acts which are injurious to their health but which are consented to. Why are they injurious? Because they violate the meaning, structure, and (sometimes) health of the human body."
If you homosexuality is a genetic disorder,or, a choice, either way, homosexuality is an error. We live in a day and age where our culture has forgotten what sex is for. (this is due to the ready availability of contraceptives, society, media.. etc) Sex is for procreation; nothing about man/man, or woman/woman coming together is conducive to sustaining life. I also think it's funny when people say it's a 'state issue'. Like the state is good at determining what's best for an individual.