That's why I shake my head in disbelief when people make statements about atheists having a lack of morals because they weren't handed down by a supernatural being. It's a feedback loop you really have to admire: societies create (or adopt) gods to reinforce their own values, and then use the gods to argue for the importance of the values and keep the ball rolling.
That's also why I chuckle at Taurothar's statement about liking Christianity's basic message. The basic message of Christianity (as a religion) is "There is one god, and Jesus is his son who died for the sins of mankind. To achieve salvation, you must embrace Jesus." It hardly sounds like something an agnostic would embrace.
Now, you can strip most of the messages of Jesus down to "Treat others as you'd like to be treated," but that's hardly unique to Christianity. I wouldn't give Jesus the credit for developing that philosophy.