Again, by naming Homosexuality as a sin, with no substantial evidence of your faith as "Truth" you are merely forcing your own faith upon people that may not necessarily agree with you.
Meaning you are trying to push your own religious agenda upon the legal system. My question to you is, how can you not see that you are doing this?
By denying a minority something based on the fact that your religion outlines it as a "sin", and then allowing people outside your faith (also sinners according to your holy book), including inter-faith marriages, then you are proving yourselves to be little more than hypocrites.
I'm sorry, I don't like to say it. But that is what it is. Blatant hypocrisy.
It's always easy to bully someone you outnumber. Again I state... Homosexuality has been around forever. We've more than proven that by surviving centuries of hostility, centuries of persecution and centuries of blatant ignorance based on fear.
Perhaps it's time for fundamentalists to focus on living their own lives instead of trying to dictate the lives of those around them? If I got married to my partner, it would have absolutely no effect on any heterosexual relationship, unless one person within that relationship was perhaps Bisexual, or a closeted Homosexual themselves.
Even then... seriously. Why would I want you (or your partner) when I am in a loving wonderful relationship with a man who means the world to me? Do all you straight men think you are so drop dead gorgeous that every Gay man could actually be bothered hitting on you?
Or ladies... do you think that every Lesbian suddenly wants to jump you? Seriously? All I sense in that logic is arrogance, egotism and stupidity. When are you guys going to realise that we'd rather have a person to live with who can, you know, reciprocate the love we have for them?