How do you know the ('heretical") Cathar Articles of Faith? Taught by a master OR personal experience/insights/

A resident of the county of Foix whom the inquisitors asked, in May 1320, if he had had a Master who had inculcated the heretic articles of faith to him, answered: "Not, it is me who invented them, while reflecting on the world. According to what one sees there, I did not think that it was God who had created it ". The answer is less naive than it appears to be. Translated into terms of theology, it means that God is necessarily innocent of the existence of Evil. All of Catharism rests indeed, finally, on this particular idea of God.

For the Catholics, God is at the same time infinitely good and all-powerful. If Evil exists, it is due to the misuse that the creatures made of their free will. This was the inner meaning of the mythology conveyed by the story about the Fall of the angels and of Paradise lost.
The Cathars refused this explanation.

With them, we are confronted by the quasi visceral refusal of imagining that Evil can originate in the free choice of a creature of God, or that it can have its place in the secret designs of Providence, or that it can be a punishment inflicted by God whose essence itself is to forgive; we are confronted by the absolute refusal to believe that an infinitely good God could create the conditions which make it possible for Evil to appear, which is to say, matter and time, in other words the World.
About all this, no reasoning is able to grasp. It is an existential attitude, which is rooted in the absolute pre-eminence given spontaneously, by the Cathars, of the infinite kindness of God, to the detriment of his absolute power. It is well in any case that their own mythology expresses this. It expresses the idea that, in their eyes, only the existence of another creative principle opposed to God, an essentially bad principle, and by vocation destructive, can satisfactorily explain the origin of Evil, and of the World.

Whereas a Catholic states "I believe in God, the all-powerful, creative Father of Heaven and Earth", the Cathar will say for his part: "I believe in God, the infinitely good, creative Father of Heaven, but not of the Earth"