Henry VIII's Dissolution of the Monasteries was an inevitable conclusion brought about by the corrupt institutions, and the pre-reformed Roman Church that backed them.
Henry VIII did not act alone in breaking from the Roman Church, but acted on the tide of protest sweeping across Europe at the Protestant Reformation. Luther, Zwingli, Calvin and many others were earlier incensed at the corruption in the Church of Rome and broke away from Rome because of its corruption, forming the protestant movement (those who protested against the corrupt practices of the Catholic Church). Part of this corruption was the selling of indulgences - 'guarantees' of a set number of years off purgatory in return for large sums of money. Luther regarded the Church's claim of 'no salvation outside the Church' as a lie, and accepted Jesus' teaching and Biblical evidence that we are saved by Grace, and not by belonging to a man-made institution.
With regard to Henry, who professed the Christian faith all his life, his main concern was that the monasteries in England, part of the Church of Rome, were also becoming dens of corruption and power and betraying the Lord's name in whom they were set up. His subjects were almost rioting in the streets because of the problems there and the money that the monasteries extorted from the faithful. Something had to be done.
Henry went down in history as an unpleasant man but he was a strong and decisive king, and a lover of the arts, a skilled musician and a benevolent and wise man unless betrayed, when he acted with the decisiveness that is expected of a strong ruler. The dissolution of the monasteries was an inevitable conclusion brought about by the corrupt institutions, and the pre-reformed Roman Church that backed them. Therefore Henry closed the monasteries across the country and imprisoned or executed those who stood in his way. This incensed the Pope.
The decision of the pope not to annul Henry's marriage to Catherine of Aragon (to enable him to marry Anne Boleyn) was not the cause of the split as many believe, but provided Henry, at last, with the excuse he needed to ignore the authority of the pope. Far from being a 'heretic' and 'anti-Roman' as many would have him, Henry lived and died a Catholic, despite the pope excommunicating him as revenge for his non-acceptance of his authority. However, his split from Rome meant that Henry now declared Jesus Christ as the head of the Church (and not the pope) with himself as 'Supreme Governor' on earth, and the Archbishop of Canterbury its spiritual leader (to this day Anglicans still believe that Jesus, rather than a human being in Rome as Catholics believe, is the Head of the Church and that the monarch is the Supreme Governor and that the Archbishop of Canterbury is the spiritual leader).
Although Edward VI, Henry's ailing son, was a protestant, his reign was short-lived because of his death very young. He was replaced by Henry's elder daughter Mary, a Catholic. She reigned with abject terror (earning her the name 'Bloody Mary') who imprisoned and executed many - including women, children and priests - who dared defy the 'Holy' Catholic Church, which represented, supposedly, Christ's forgiveness and love.
After her welcome death her younger sister took over, Elizabeth I, who restored Protestantism to the country - not because the beliefs were different - they weren't, mostly, but the attitude, openness, honesty and love shown was certainly different after the corruption of the Catholic Church as it was then, and certainly different from how Mary interpreted it. The Nicene Creed was still used in its entirety in the new Church of England, as it still is today even in my own church. But the empire-building nature and power base of the catholic Church was removed. As a result of Henry's split, services in the new Church of England were said in English for the first time thanks to the Book of Common Prayer. The Bible became translated into English so that anyone who could read was able to read the scriptures without having to rely on a priest to tell them. Elizabeth's successor, James, was responsible for the Authorised version of the Bible (the 'King James' Version) still in use today.
England break with the Catholic Church