"The less depth a belief system has, the greater the fervency with which its adherents embrace it. The most vociferous, the most fanatical are those whose cobbled faith is founded on the shakiest grounds."

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Idiosyncratic belief systems which are shared by only a few adherents are likely to be regarded as delusional. Belief systems which may be just as irrational but which are shared by millions are called world religions.

— Anthony Storr