The reason is that liberty is part and parcel of the Christian faith.
No other faith, dogma, or creed to my knowledge comes close and for one good reason. The one true God - the Jehova God, the Father of our Lord Jesus Christ is against slavery to sin and freedom from the bondage of sin.
Socialism, Marxism, and/or Communism cannot exist with a Christian people.
Destroy the culture, destroy the country.