9: The failure of religion to improve or clarify over time.
Over the years and decades and centuries, our understanding of the physical world has grown and clarified by a ridiculous amount. We understand things about the Universe that we couldn't have imagined a thousand years ago, or a hundred, or even ten. Things that make your mouth gape with astonishment just to think about.
And the reason for this is that we came up with an incredibly good method for sorting out good ideas from bad ones. We came up with the scientific method, a self-correcting method for understanding the physical world: a method which -- over time, and with the many fits and starts that accompany any human endeavor -- has done an astonishingly good job of helping us perceive and understand the world, predict it and shape it, in ways we couldn't have imagined in decades and centuries past. And the scientific method itself is self-correcting. Not only has our understanding of the natural world improved dramatically: our method for understanding it is improving as well.
Our understanding of the supernatural world? Not so much.
Our understanding of the supernatural world is in the same place it's always been: hundreds and indeed thousands of sects, squabbling over which sacred texts and spiritual intuitions are the right ones. We haven't come to any consensus about which religion best understands the supernatural world. We haven't even come up with a method for making that decision. All anyone can do is point to their own sacred text and their own spiritual intuition. And around in the squabbling circle we go.
All of which points to religion, not as a perception of a real being or substance, but as an idea we made up and are clinging to. If religion were a perception of a real being or substance, our understanding of it would be sharpening, clarifying, being refined. We'd have better prayer techniques, more accurate prophecies, something. Anything but people squabbling with greater or lesser degrees of rancor, and nothing to back up their belief.