Why did Roger Williams disagree with the puritan leaders?

He argued that an individual Christian would know when he was saved, but could not know about the salvation of others. Therefore, it was senseless to require a religious qualification for voting. In essence, Williams was calling for the complete separation of church and state, a position that undercut the authority of the church and civic leaders. Williams obtained a royal charter for Rhode Island in 1644, an action that demonstrated a practical side to his character. Under Williams' influence, Rhode Island became a haven for those who suffered from religious persecution, including Jews and Quakers. The Puritan leaders of Massachusetts were adamantly opposed to Williams’ views, but were perceptive enough to recognize that the Rhode Island colony provided an important service. Dissidents like Williams and Anne Hutchinson could be quietly dealt with through exile. If, however, they were imprisoned, executed or sent back to England, questions would be raised about the conduct of affairs in the Bay Colony. The last thing the Puritan fathers wanted was increased attention from the officials in London.