We should be encouraging sin

I think we need to make a very clear distinction between doing wrong and sinning.
It's easy to define what is wrong. It's something you do that causes harm, or could cause harm, to others. It must be wrong to murder, rape, steal or drive at 70mph in a 30 mph zone. Similarly it's wrong to pollute the sea or be rude to your parents. This all seems very sensible to me.
What seems very unsensible is the concept sin. Sin harms nobody else. It just offends the sensitivity of easily offended people.
Who cares about gluttony? Why is this a sin? If someone wants to eat so much that they get obese; are the subject of ridicule; and find it uncomfortable to walk, then that's totally up to them. The only time that a glutton can possibly be wrong is when they get the seat next to you on a trans-atlantic flight.
Why is homosexuality wrong? Who possibly gets harmed by it? No-one. It's just the fact that its in the bible as a sin.
And even adultery. If the partner is hurt by it then it must be wrong. But if both partners agree to having an open relationship, as many do, then who gets harmed? No one. So why is it wrong?
It strikes me that sins are all those things that make life fun.
In 1789, the philosopher Jeremy Bentham launched his thesis on utilitarianism - basically saying that all actions should be judged on whether they added or detracted to the greater happiness of human beings. He was so right. And wrongs detract from human happiness but sin adds to it.
I think this must be the winning ethos for any political party wanting to run our country. Let's see Mr Cameron's new Conservatives entering the 2009 Election with the slogan - "Thou shalt sin" - I'd vote for that.