The 'facts' are pretty simple. He believes in an invisible friend, who is his pal, who created and runs the universe. I, on the other hand, think that people who think there is some imaginary person running the universe are kinda insane. If I'm right, and they are insane, then there is no need to go further. Insane persons can not participate in rational debate.
If Rick Warren, or even Obama, or anyone else, somehow thinks that a bunch of nomads, wandering in the desert a few thousand years ago, who could not even as much as describe the rock their ass sat upon, somehow came up with a bunch of rules that are the best guide for people living in the 21st Century, well, what's to talk about?