Homosexuality is nothing like race. An Asian cannot decide not to be Asian. The very idea is preposterous.
Male homosexuals seem to be born with an inclination/desire to engage in perverse quasi-sexual activities with other males (Lesbian is an entirely different proposition, and must be discussed separately). Homosexual "sex" is a grotesque parody of sexual intercourse, the purpose of which is HUMAN PROCREATION. The purpose of homosexual acts is to have an orgasm. Homosexual acts are intrinsically unilateral. One party is gratified by the second party; they are not having sex with each other. One is having sex, the other is being used for sexual gratification.
Obviously, heterosexual relationships also include similar acts, but those are ancillary to the essential sexual intercourse.
Every major religion in human history abhors homosexual acts. They are anti-biological and intrinsically evil. Current Leftist "thought" is that there is no such thing as Malum in se - intrinsic evil. To a Leftist, unless there is an identifiable "victim" there can be no "crime." Hence, if two homosexuals engage in these acts voluntarily, no victim equals no evil. Homosexual "sex" is as morally neutral as consensual sexual intercourse between normal adults.
Every human is inclined to do evil. We are all greedy, envious, cruel, hateful, etc., It is part of the human condition. The fact that homosexuals "are born that way" - they did not choose to have these desires and tendencies - is morally irrelevant. I was born desiring to steal from the Government and Insurance companies. I was born wanting to copulate with teenage girls. I was born to drive too fast. None of this excuses immoral behavior, and a homosexual cannot claim that his sinful inclinations excuse his immoral behavior. None of us can. God never said that we have a right to copulate with whomever we are inclined to copulate with, even if they are willing. Is adultery OK if both parties keep the activity a secret, forever? No.
No one should be sanctioned in any way for their INCLINATIONS. I have more than one relative who are celibate homosexuals. No issue. One relative lusts after pre-pubescent girls, but has never acted on his inclinations.
But once a person publicly embraces a lifestyle that essentially involves homosexual sodomy, they are subject to various forms of social sanctions - "marriages not recognized," partners not invited to family functions, not invited to church-related celebrations like First Communions, etc. They might be dis-inherited, or shunned altogether. That's life. Always has been. People have been shunned for marrying outside the religion or nationality, marrying someone who is objectionable to the family for any number or reasons.
You have no right to demand that others accept your choices, when you know that those choices go against their strongly-held beliefs.