C.S. Lewis gave an address titled Christian Apologetics (found in God in the Dock) to Anglican priests and youth leaders at a church in Wales where he made a distinction between Thick and Clear religions:
By Thick I mean those which have orgies and ecstasies and mysteries and local attachments: Africa is full of Thick religions. By Clear I mean those which are philosophical, ethical and universalizing: Stoicism, Buddhism, and the Ethical Church are Clear religions. Now if there is a true religion it must be both Thick and Clear: for the true God must have made both the child and the man, both the savage and the citizen, both the head and the the belly.
Thick religion accounts for the goodness of our “parts and passions”, as previous writers called them. It’s important to say the goodness of the passions, because most belief systems do something with them, and at least since Plato the West has tended to consider the body something to ultimately escape. To be in heaven, tragically even in many Christian churches, is to be airily disembodied. So ethereal has come to mean “heavenly” and “light, thin, airy.” Thick religion embraces the goodness of beer and baseball, of bed and board.
Clear religion utilizes what the West has identified as fundamental to our species, homo sapiens, thinking man. Man may love bread, but he doesn’t live by it alone. He thinks, studies, compares, classifies, and writes poems about it. Someone said no pleasure is complete until it is remembered. So Thick and Clear go together. Lewis argues that only two religions really combine these, Hinduism and Christianity.
But Hinduism fulfills it imperfectly. The Clear religion of the Brahmin hermit in the jungle and the Thick religion of the neighboring temple go on side by side. The Brahmin hermit doesn’t bother about the temple prostitution nor the worshipper in the temple about the hermit’s metaphysics. but Christianity really breaks down the middle wall of the partition. It takes a convert from central Africa and tells him to obey an enlightened universalistic ethic: it takes a twentieth-century academic prig like me and tells me to go fasting to a Mystery, to drink the blood of the Lord. The savage has to be Clear: I have to be Thick. That is how one knows one has come to the real religion.
The Son of man came eating and drinking. The Word of God took on flesh, and after his bodily resurrection Jesus ate fish and honey. In Him we see a continual adventure, truth and wonder for the mind, and exultant joy in the body; we find the way, the truth, and the life seamlessly woven together.