> For an authoritarian government to work long term they have to be the highest power. This is why the Soviets worked so hard to destroy the church as well as the concept of family, people who value god or family above the government are a threat.
The Soviets did that largely because that's part of Marxist doctrine that Lenin didn't explicitly abandon, not because it is objectively useful for authoritarian regimes’ longevity (as evidenced by the fact that authoritarian regimes where the state was unified or allied with religious authority and promoted the value of family have done quite well, and were long the norm.)