There are a score of great religions in the world, each with scores or hundreds of sects, each with its priestly orders, its complicated creed and ritual, its heavens and hells. Each has its thousands or millions or hundreds of millions of true believers each damns all the others with more or less heartiness - and each is a mighty fortress of graft.
Upton Sinclair (2005). “The Profits of Religion”, p.23, Cosimo, Inc.
