"Check out their hearts: the hearts of a loving, committed gay couple look just like the hearts of a loving, committed heterosexual couple.
Something tells me that THAT is where God looks first."
That is true. God looks on the heart. But what does He see there? Even in the hearts of a "loving couple", He sees idolotry, bigotry, sexual immorality, deceit, malice, adultery, stealing, vanity, covetousness... People idolize their churches because those churches make it ok for them to sin, practice bigotry against those they do not agree with, hop from bed to bed on Saturday night before coming to church on Sunday, then lie about all of it with malice aforethought to make others look bad... They take illegal drugs, lying, cheating and stealing to get them, steal intellectual property and refuse to pay for any of it, covet their best friend's wives and plot how to get in their pants. They say they are 'good', but their hearts are open graves before God, wicked and deceitful above everything else. All this they practice, and more, all the while slowly abrogating God's law with doctrines of men, screaming at God while shaking their collective fists, "but this is my nature, why can't I sin as much as I want?"
The reason you can't sin is not because you'd better not sin, but because God has buried you in Christ in baptism, and raised you to newness of life. Praise God that this sinful flesh I inhabit will die one day, and along with it all that is impure. Those who would choose to sin, using as their excuse "this is who I am", are missing the point. I sin, but I hate my sin. It's in my nature to kill, steal, blaspheme, commit adultery, lie, cheat, desire evil, and worship false gods... It's who I am, but I shouldn't be allowed to do those things, anymore than anyone else should be allowed to sin.
I'm an LCMS Lutheran. I will not tolerate someone telling me that their sin is OK while mine is not. It's wrong for people to do that. Practice what you will, but when you turn around and make me into the outcast because you want to practice your sin, then you have put a heavy burden on us. Pretty soon you'll be picketting outside our churches, calling us bigots, tearing down our alters... All the while using as your excuse, "it's in my nature to sin, why can't I sin as much as I want?"
God's gospel is not "it's in your nature to sin, so I'll look the other way because you're not perfect". God's gospel is, "I am both just and the justifier of the wicked, and have not spared even my own son in order to forgive". Our response to that should not be to sin more, but to love God because he has reconciled us to himself through the death and blood of Jesus Christ. When sin requires that much blood and suffering to reconcile us before God, I as a child of God have every right to hate that sin.