Ah, I thought that was where you were going with this. I assure you that us liberals have no intention of "watering down" Christianity- many of us are actively seeking the true Christianity, as it was passed to us through Christ and before it became encumbered with the trappings of human religion and baggage that has nothing to do with Christ's message. Biblical literalists, for instance, force a modern notion of historical fact onto the Bible that would never have occurred to its authors.
The difference between me and you, however, is that I would never dream of denying the fact that you are a Christian. We are all children of Christ, and semantic disagreements about the nature of the creation are not what defines us. If they are, then someone's priorities are quite out of line.