We'll soon begin to look into how the Royalists could have won and what that would have meant for religion, and thus culture in England. A subject of present consideration in this project is at which point the Royalist actually won.
The English Civil War was actually a series of conflicts between the King of England and Parliament. The conflict emerged over taxes, which Parliament at the time was responsible with collecting and was capable of collecting in ways far more effective then those employed previously by the English government. So much so that the King came to rely on Parliament to finance the government and in this position Parliament effectively held the state under its power and began to request greater influence. The build up to the war saw this granted to Parliament until loyalties began to be divided with Parliament being seen as an avenue for personal power by those who without it wouldn't have come into power. The conflicts ended in a Royalist victory which brought about tax reform, and a return to the days when it was merely advisory to the Kings of England to be summoned or dismissed at the Kings discretion. This devastating series of conflicts serving as caution regarding the rule of many and the motives of greed and demagogues. King Charles I, known for his conservative finances, would continue to reign during and after the conflict with England knowing peace abroad parting this world at 56 years of age (1657) with the throne passing to his son Charles II (at the age of 18 having accompanied his father to battle at 14 years of age).
Theater of the Motherland
(the civil War in England)
North American Theater
While the War is often seen as a localized conflict in the British Isles this isn't entirely true. There existed a general divide between the Southern Royalist Virginia and the Northern United Colonies of New England.  By mob, privateer or militia the conflict was fought as the Governors did what they could to keep Order with Royalist William Berkeley to the South and chiefly in the North Parliamentarian and Puritan Separatists. The Puritan uprising was effectively put down by the Lord Baltimore in Maryland.
Comparing to OTL: What a Royalist Victory Means
- The most immediate impact is that Parliament is consigned to its pre-civil war position in OTL (as in its advisory and aid to the King) and the precedent that it exists at the King's discretion is established.
- The Act of Uniformity 1558 is not repealed by Oliver Cromwell thus the war sees a large exodus of Puritans from England far sooner then in OTL (see Great Ejection of 1662) as England continues to follow a doctrine of religious conformity under Charles I. This exodus of Puritans and defeated Parliamentarians has one ideal location in which to travel; Plymouth Colony and the United Colonies of New England which itself was established by Puritan separatist and parliamentarians.
- Meanwhile in Virginia, William Berkeley remains governor rather then ousted by Cromwellians and continues to serve as governor uninterrupted until 1676/77. The Virginia House of Burgesses right to exist with out governor or monarch's consent is not established in 1670 due to the lack of a Cromwellian administration in the colony.
- Maryland as well continues under the government of the Lord Baltimore. The Tolerance Act passed in 1647 isn't repealed in 1649 thus sparing the Anglican and Catholic population of Maryland persecution.
- The Charter for the Province of Carolina (Carolana) has been handed from Heath to John Berkeley who doesn't go into exile after the war having been a Royalist. John Berkeley in OTL is known as the founder of New Jersey and in this timeline he'll be founder of Carolana (or Carolina) and a different man to some degree. His influence in France while in Exile never happen.
- The 'Act of Seclusion' is not sent by the English Commonwealth (which doesn't exist) to the Dutch Republic and thus the House of Orange is not barred from the Stadholdship.
- In more tolerant news regarding this victory, Charles II developed a belief in religious tolerance during the civil war rather then after the conflict and thus with now absolute power over state he can begin reform though their will be opposition. Seeing what conflicts followed the Civil War in OTL this opposition may be difficult to manage especially for the young King.
- Royalist Victory: A Royalist Victory currently serves as the earliest POD of this timeline. The question is how and when do the Royalist win? I have to look at the first and second conflicts to determine this and military history is not my strong point.
- New England after the Civil War: Parliament doesn't send commissioners to enforce a Parliamentary Authority in Maryland. Thus Puritans do not take control of a colony which had been established as a Roman Catholic refuge by the Lord Baltimore. Roman Catholic governance, despite the colony's Puritan majority, would continue as well as the government experience in Maryland prior to the Battle of the Severn in OTL. This government permitted for a General Assembly to be summoned by the Lord Proprietor. This assembly was to consists of every lord of ever manor in the province (once erected in the territory) who would have equal voice and a seat to be accompanied by two freemen for every hundred (or good number of them as they see fit) in the region. As with Parliament back home following a Royalist victory this assembly only exists at the Lord Proprietor's discretion and this government's continuation will see the rise of a nobility (a class of Lords) in New England following the conflict.