Why did Roger Williams turn down the Boston pastor's job?

Roger Williams turned down the Boston pastor's job because he believed in the necessity of religious freedom and the separation of church and state, principles that were not fully embraced by the Puritan leaders in Massachusetts. He had differing views on the treatment of Native Americans and the legitimacy of the colony's charter, which he felt was unjust. His commitment to these beliefs ultimately led him to seek a more tolerant environment, resulting in the founding of Providence Plantations in Rhode Island.