I would like to create a scenario wherby the religious and political roles of North America and England are reversed. I would like the POD to be between 1620 and 1660. There is no United States, North America is ruled by a King, and is mostly a secular state that is nominally Anglican. England has no monarchy, has a constitution almost identical to the US, and has no state church. In England, the numbers of Methodists, Baptists, and Catholics have exploded due to the free marketplace of ideas.
My idea: POD 1620: the pilgrims never land at Plymouth. As a result, the whole puritan exodus from England is halted, and there are more puritans to back Cromwell's revolution. The monarchy is never restored, and eventually "We the People" becomes England's. Royalists are basically considered witches, and are expelled to North America. New London is established where Halifax or Boston is in the OTL, and the monarchy is continued there. George Whitfield and the Wesleys never bother coming to North America, and the Great Awakenings are more of a factor in England.
Questions: does the British constitution arise out of Cromwell's revolution, or is a second revolution neccesary? What happens to slavery in North America? What happens to the French? The Spanish? The native Americans?