Claim: Marcion of Sinope developed the ditheistic system of belief (the notion of one high god and one lower god) in 144, and he entirely opposed the Tanakh.
Evidence: Marcion responded by developing a ditheistic system of belief around the year 144. For example, a ditheistic system could be one in which one god is a creator and the other a destroyer. In contrast to other leaders of the nascent Christian Church, however, Marcion declared that Christianity was in complete discontinuity with Judaism and entirely opposed to the Tanakh.