No one on that side is recognizing that "What gives you the right to push your morality on others?" is exactly aimed at pushing their morality on others. It seems strange to me that the hateful speech of "You're just a homophobic hater!" is never recognized by those protesting what they see as hate. No one protesting those who hold that homosexual behavior is a sin is asking whether or not homosexual behavior is a sin or not. That question is irrelevant, apparently.
I would suggest that the question is central ... and not trivial. Consider the facts. Historically, the entire history of the Church has been to hold this particular behavior as clearly biblical sin. The only point of deviation is the last 50 years. Scripturally, every biblical reference to homosexual behavior is negative, calling it sin or worse (like "abomination"). No biblical reference paints the behavior in any positive light. Worse, Paul's reference links it not to mere sin, but part of a string of assurances of exclusion from the kingdom.
Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived: neither the sexually immoral, nor idolaters, nor adulterers, nor men who practice homosexuality, nor thieves, nor the greedy, nor drunkards, nor revilers, nor swindlers will inherit the kingdom of God (1 Cor 6:9-10).Isn't it odd that no church figures are calling on Christians to embrace thievery, covetousness, or adultery? No one is standing there demanding that we love idolaters like Jesus did. There is no question on those. This one, however, is somehow different.
So, the question. What if it's true? What if the historical Church position is true? What if the biblical position is accurate? What if homosexual behavior really is a violation of God's commands? What if Paul was accurate in describing that behavior as an indication of being outside of the kingdom of God? What then? If it is true, I would think it would be obvious that no one of any character would want to embrace this behavior either in themselves or in those they love. If it is true, I would think that clear warnings would be the kindest thing to do.
I live in the desert. I can imagine a parallel process here in a hike with a friend in the desert. My friend tells me, "I don't believe in snakes." I see that he's about to step on a rattler. What should I do? In today's environment they would necessarily tell me, "What gives you the right to push your views about snakes on others? What are you ... some kind of hiking hater? Why don't you just embrace your friend's desire to walk where he wishes?" I should not consider, "But ... that could kill him."
What if it's true? If it's true that a commitment to homosexual behavior (and sexual immorality and idolatry and adultery and theft and greed ...) are all indications that you are outside the kingdom, I would be remiss -- unkind and uncaring -- in remaining quiet. I would be cruel to fail to call for repentance. I would be hateful to fail to point to the danger.
What if it's true? That's the question no one seems to want to answer. If it is true, then it isn't a matter of foisting morality; it's a matter of deep and caring concern. If it is not, then we have genuine reason to question Scripture, Church history, the abilities of the Holy Spirit to lead His own into the truth, and, consequently, Christianity itself. We really should ask the question.