Final answer:
Minister Roger Williams introduced freedom of religion and separation of church and state in Providence, differentiating it from the Massachusetts Bay Colony's religious intolerance and theocratic rule.
Step-by-step explanation:
Minister Roger Williams implemented two significant changes for Providence that distinguished it from the Massachusetts Bay Colony. The changes he implemented were a) Freedom of religion and separation of church and state. Williams believed in complete freedom of religion, even though he did not extend this freedom to Quakers, and he argued for a complete separation from the Church of England.
Unlike the Massachusetts Bay Colony, which held strict Puritan beliefs and did not tolerate dissenting views, Providence became a sanctuary for those seeking religious freedom and democratic government structures.