Lets talk about that for a moment. This is a moral issue based on the actions of a person. There is no morality in the color of person's skin or their nationality. The person is just black, brown, or white, but it carries with it no action of their own volition. Now you may say being gay is the same. But being gay requires a choice on the persons behalf to engage or act a certain. As I stated before, if all a person needs is simple desire to justify one's actions we are all in trouble. And unfortunately that is the base of the argument presented. I am attracted to this so that means I need to fulfill my desire.
That is not enough to say a person's belief then should be supported. I have stated that I choose not to actively support nor deny them the rights they seek. I support some things they desire, some I question, and others I oppose. But there is no people group that has absolute support from me or you. If I said do you support civil rights, I believe you would say yes. But in same breath you don't support AA. How about reparations? I don't hate or judge, but I am not going to buy into any idea that I don't agree with. And there is zero wrong with my belief that a person born a certain gender should live in accordance with the expectations of that gender. And I have billions to support that my belief is not without merit.
I've said it a thousand times before on this forum, I'll say it again - morals are subjective. It is not a moral issue. It is a legal issue, a rights issue.
I already posted a thorough piece covering your idea of people choosing to be gay, and again, to say nothing of the research indicating that it is genetic, not a choice. You may wonder about those who stay in the closet, in which case you need look no further for the cause than people like you, people like Henderson and McKinney, or other forms of social stigmatization. Now, if you are willing to concede that there is no choice in the matter, then we are done here, because if you would then still seek to discriminate against homosexuals, you open the door to discrimination of others (blacks, women, et cetera).
Desire is enough to justify one's actions, if it does not violate the rights of others. If two heterosexual individuals wish to engage in consensual sex, they desire to engage in consensual sex, it is considered normal and acceptable. Why is that different for homosexuals? If two heterosexual individuals desire to be married, it is considered normal and acceptable. Why is that different for homosexuals? Because marriage is a sacred union between man and woman? That argument is inherently flawed - it is the secular codifying of a religious sacrament.
In at least one of your previous posts, you have posited that you may find a coworker attractive, you may desire to have sex with her, but you wouldn't, because you are married. That argument does not actually say anything against using desire to justify one's actions. You chose to enter a contract with your wife to abstain from relations with anyone else. Totally different.
It is not a belief for homosexuals. It is who they simply are, and you would seek to deny them their rights as equal human beings. There is everything wrong with your belief that people should live as their physically-born gender, including seeking relations only with the opposite sex. It is not a choice, humans are attracted to whoever they are attracted to. I would guess that you find your wife beautiful. I have never seen a picture of her, and I am not asking for that, but I might not find your wife particularly attractive. We all have our "type", what we like, and why is it so hard to acknowledge that some people believe their "type" happens to have the same gender as them?
That you have billions to support your view does nothing to help it or to hurt it. China has a billion people that think communism is pretty awesome. Does that make them right? Well, I don't want to start another massive war here with the local communists, but no, it doesn't. America has a few million people that think Obama is a Kenyan Muslim space-alien or whatever nonsense. Does that make them right? No, it doesn't. North Korea has millions of people who think Kim Jong Il was born on a sacred mountain to the accompaniment of rainbows. Does that make them right? No, it doesn't.