This post reflects the opinions of the poster, opinions which may be shared by others and which may contain facts.
My made-up '-ism' that dispenses with the need to specify any imagined thing not believed in:
RAEism: A belief in reality, all that is real and existent, as opposed to myth or that which is imagined to be real; that reality is knowable, and a humble acknowledgment that the totality of reality is not yet known and may never be known.