Why: They just got pounded by the Supreme Court.
Answer: A cult/philosophy/"religion" of 250,000 followers that ... Uch. Instead of trying to figure out WTF this is supposed to say:
Summum's philosophy stems from what it considers to be principles of nature that cannot be accredited to any person. These principles flower in different forms and were outlined before in the writings of The Kybalion first published in 1912. But Summum, considering The Kybalion incomplete and antiquated, rewrote the book after it entered the public domain. The new derivative work utilized a more modern language and incorporated the new information that was presented to Ra by the Summa Individuals. ... The basis of the philosophy is the "Grand Principle of Creation" that states, "Nothing and Possibility come in and out of bond infinite times in a finite moment". The principle of creation generates the totality of existence which the Summum philosophy refers to as "SUMMUM", and from this master principle emanate "Seven Summum Principles" known as Psychokinesis, Correspondence, Vibration, Opposition, Rhythm, Cause and Effect, and Gender.
The More You Know: Summum practices mummification. Here is a picture of a cat being mummified by some Summummerrerrrsss.