"The problems associated with human existence on Urantia (Earth) are impossible of understanding without a knowledge of certain great epochs of the past, notably the occurrence and consequences of the planetary rebellion. Although this upheaval did not seriously interfere with the progress of organic evolution, it did markedly modify the course of social evolution and of spiritual development. The entire superphysical history of the planet was profoundly influenced by this devastating calamity."
[67:0.1] 

"Lucifer charged that the Universal Father did not really exist, that physical gravity and space-energy were inherent in the universe, and that the Father was a myth invented by the Paradise Sons to enable them to maintain the rule of the universes in the Father's name." 
[53:3.2]