In his later writings, Jung argued that the Christian God-image was one-sided in that it left out the factor of evil.
Through studying the historical transformations of God-images, he attempted to correct this (especially in Aion and Answer to Job).
In his note on how Answer to job came to be written, he wrote that in Aion he had “criticized the idea of the privatio boni as not agreeing with the psychological findings .
Psychological experience shows us that whatever we call ‘good’ is balanced by an equally substantial ‘bad’ or ‘evil.’ If ‘evil’ is non-existent, then whatever there is must be ‘good.’
Dogmatically, neither ‘good ‘ nor ‘evil’ can be derived from Man, since the ‘ Evil One’ existed before Man as one of the ‘Sons of God.’
The idea of the privatio boni began to play a role in the Church only after Mani. Before this heresy, Clement of Rome taught that God rules the world with a right and a left hand, the right being Christ, the left being Satan.
Clement’s view is clearly Monotheistic, as it unites the opposites in one God.
Later Christianity, however, is dualistic, inasmuch as it splits off one half of the opposites, personified in Satan . … If Christianity claims to be a monotheism, it becomes unavoidable to .assume the opposites as being contained in God” (1956, CW II,§ 357-58). ~The Red Books, Vol. VI, Page 213, fn 50