Every natural fact is a symbol of some spiritual fact. – Emerson
Most modern religions have doctrine: holy books, sacred scripture, lists of quoted dogma from sainted heads, annals of kings and battles adjudicated by the eternal powers, recipes for weddings and births and deaths, and so on. Beliefs to be memorized.
I’ve written at length about doctrine and dogma before, and I think it’s dangerous stuff. Instead of opening the mind and allowing spiritual growth and development, doctrine shuts everything down. It can be valuable to have blind faith in some things, for a while, at least; but to keep yourself open to the world and to Spirit, it’s essential to keep your mind alert to new experiences that might contradict your faith. You have to believe in something, but hold your beliefs lightly.
Pagans generally avoid doctrine. Instead of big books of instructions, we rely on two currents: tradition and nature.