An Excerpt From The Christian Delusion.

The Great Wall of Faith: designed to keep reality
out and ignorance in.

I'm currently reading through The Christian Delusion: Why Faith Fails which is edited by John Loftus who blogs over at Debunking Christianity. The book is a compilation of essays, and the one I just finished is titled Christian Beliefs through the Lens of Cognitive Science, byValerie Tarico, PhD.

Here is a section of that piece that I think we can all relate to.

...Worship practices, music and religious architecture have been optimized over time to evoke right-brain sensations of transcendence and euphoria. social insularity protects a community consensus. Repetition of ideas reinforces a sense of conviction or certainty. Forms of Christianity that emphasize right belief have built in safeguards against contrary evidence, doubt, and the assertions of other religions. Many a freethinker has sparred a smart, educated fundamentalist into a corner only to have a believer utter some form of "I just know". (p 54)

Who among us haven't struck the all too familiar wall of knowing what I know, because I know it?

This is Purgatory