What made Massachusetts Bay Colony a theocracy?

well read this "The Puritans established a theocratic government with the franchise limited to church members. Winthrop, Dudley, the Rev. John Cotton, and other leaders zealously sought to prevent any independence of religious views, and many with differing religious beliefs-including Roger Williams of Salem and Anne Hutchinson of Boston, as well as unrepentant Quakers and Anabaptists-were banished"