Once you've said that homosexuality is a sin, you've now made the difference between you and those who would deny gays rights, or worse, merely one of tactics. You conflating it with activities which actually ARE harmful to others, provides a smoke screen for people who are willing to condemn homosexuals, isolate them, and generally make them miserable.
What I would much prefer the moderate religious say is that they don't condemn homosexuals because homosexuality doesn't hurt people, it doesn't impinge in any way upon the freedom of those that aren't gay.
I like the analogy that PZ Myers (and I believe Dawkins as well) give, that their aim is for religion to be like knitting or bowling. That it be like a hobby some people enjoy in privacy, or together, that has its own institutions, but doesn't inject itself into politics or wage divisive cultural battles over harmless behavior, or worse, actual battles.
From Effect Measure: http://scienceblogs.com/effectmeasure/2 ... te_104.php
So in the spirit of summer laziness, here's what I like about the knitting analogy: it suggests the conditions under which religion would be relatively harmless, maybe even useful. Knitting is a private, or at least personal avocation. Knitters don't want everyone else to be a knitter. They are satisfied to knit on their own or with other people who like to knit. A knitting club. It's social. Knitting is a way for many people to relieve tension, or, when times are tough, to occupy themselves. For these people, knitting is comforting. If you've ever seen the products of really good knitters, it can also be creative, so knitting is a source of creative inspiration. Knitting is socially acceptable. It doesn't set a knitter apart from their non-knitting fellow citizens. Whether you are a knitter or not isn't a matter of personal worth. It is assumed that knitters are just as good people as non-knitters.
In short, knitting is unobjectionable because it is kept personal, it is not the source of invidious distinctions, it can be fun and lead to pleasant social interactions, it is a comfort for many people, and is a source of creativity and even inspiration. If religion were like knitting, I wouldn't object to it.
Another part of this analogy that went mostly ignored here is that knitters don't demand respect that they haven't earned. You don't see top knitters being put on the news to give their commentary on foreign policy or women's reproductive rights. But for some reason, it is perfectly acceptable to use bishops and such as an authority over areas which they do not have any special expertise. Their expertise ends at the church door, and it should be treated as such.