Let us deal directly with the issue of homosexual activity from a Quadrilateran persepctive.
Great! So let's look at scripture, tradition, experience, and reason.
Mark1, I think between you and the religioustolerance article that we have covered scripture directly bearing on homosexuality. I would add that, if insistence is placed on the Leviticus verse, then an explanation is required why all the other behavior laws in Leviticus should not be followed, too.
As you noted, Christian tradition is focussed on heterosexual marriage.
So now let's look at experience. Let's start with sexual orientation. Did anyone here
choose your sexual orientation? Did any of you have the following conversation with yourself: "I am equally attracted to both genders but, since I know homosexuality is a sin, I will be attracted only to the opposite sex"? I know I didn't. By 7 years old I was looking at girls and going "pant, pant, drool, drool" and looking at boys and going "yechh".
So my experience is that I was born heterosexual and I did not choose to be this way. Why should I think that homosexuals would have a different experience for their sexual orientation?
Experience of God's Creation in the form of science also shows that sexual orientation is determined by genetics, not choice. I know of the discovery of at least 4 genes that are involved in sexual orientation. Change the allele (form of the gene) of any of these genes and the individual begins homosexual behavior as opposed to heterosexual.
Several years ago my church looked at homosexuality and society as part of the adult Sunday school class. The teacher invited a gay man in to talk about his life. What he said impressed me. After describing several incidents of discrimination, threats of violence, and even a couple of beatings, he asked "Why would I
choose this lifestyle? If I had a choice of being heterosexual or homosexual, why would I choose homosexuality when the result is verbal attack, fear of violence, and being beaten up?" Good question. If he
could be heterosexual, then he would be much happier being so. There is no motive for his being gay.
So now we move to reason. Much of
heterosexual behavior is a sin: rape, incest, pedophilia, necrophilia, polygamy, etc. Sex is not sinless simply because it is heterosexual. However, heterosexuals do have a "safe zone" where sex is not sinful in our culture: within the confines of a monogamous marriage. Shoot, even sex between single heterosexuals is not strongly condemned. I, as a heterosexual, am not condemned if I have sex within a marriage. So,
if homosexual sexual orientation is not a choice, and if heterosexual sexual orientation is also not a choice, and if I as a heterosexual am allowed a judgement-free condition to have sex, then it follows that homosexuals would also have a judgement-free condition to have sex.
Now we circle back to scripture and bring it into reason. We are commanded to "do unto others as you would have them do unto you" and "love your neighbor as yourself". How would I feel if people forbade me to be with the woman I love in a loving relationship that includes sex? Would I want that done to me? Homosexuals are my neighbors. They are also children of God. When Jesus taught us to pray in the Lord's Prayer by saying "abba", I didn't see an asterisk there saying homosexuals were an exception. Am I showing love toward homosexuals when I deny them the same judgement-free zone to have sex that I enjoy?
Which still leaves tradition. And here we have one of the questions raised by the speaker in the link I posted: should we blindly follow tradition when it interferes with the Great Commandment?