Chaos Undivided is not a religion; it is a philosophy, a philosophy of the self interest, of tangible power and the shattering dread of the ultimate Truth. This philosophy teaches a human that if he is ambitious enough he would be rewarded, it teaches him that if he kills with the name of the True Gods on his lips he would catch their eye and receive their boon, it teaches him that one day he can become a demigod, a mortal no more, and all this if he only wills it and dares it.
The Primordial Truth is also the philosophy of the metaphysical, where reality and dogma shatter, a philosophy that teaches its followers that the laws of physic do not exist, that any laws are artificial, that dogma and ad a closed mind lead your soul to be shattered by the dreaded dream predators. Chaos Undivided is a philosophy that teaches you that you have a soul, teaches you that with your dreams you shape the universe and it teaches you that nothing is impossible, everything can be done if only one dreams it.
That is why a chosen one bears proudly the Star of Chaos even if he pledged his allegiance to only a variant of this philosophy, perhaps to Nurgle's teachings, it is because once you pass over the skein of reality and you see the vast landscapes of infinite possibilities nothing can ever be the same and everything becomes possible, all that is required is a simple dream.
Though the gates that stand between the mortal world and the immortal Realm of Chaos are now closed to me, still I would rather die having glimpsed eternity than never to have stirred from the cold furrow of mortal life. I embrace death without regret as I have embraced life without fear.