Final answer:
Henry VIII initiated substantial changes by establishing the Church of England and seizing monastic assets, although doctrinally the Church made few initial changes. The impact of these changes was profound, affecting religious practice, royal authority, and economics in England.
Step-by-step explanation:
Henry VIII made substantial changes to the religious landscape of England by rejecting the authority of the Catholic Church, primarily because the pope would not annul his marriage to Catherine of Aragon. This led to the establishment of the Church of England with the king as its head, as legislated by the Act in Restraint of Appeals and the Act of Submission of the Clergy. Although doctrinally there were few initial changes, a significant secular shift occurred as Henry dissolved the monasteries and seized their assets, bolstering the royal treasury. Under his children, Edward VI, Mary I, and Elizabeth I, religious policies fluctuated significantly, reflecting their individual beliefs and political aims.