Beliefs which are not subject to question or verification. Seen another way: a virulent, stable meme complex with a strong capability to replicate.
For example: "The Bible (i.e. the Protestant Canon) is the Word of God" - no evidence; not subject to rational examination; believed in whole or part by hundreds of millions of people. Once a dogma gets rolling, it's very hard to kill it, since those infected are impossible to reason with.