The reign of Edward VI saw great religious upheaval from a Protestant religion that was Catholic in nature to a more clearly defined and radical quasi-Calvinism. In that sense religious policy hardened. But the policies and ideal never became deeply entrenched and accepted throughout the country and often only existed to serve the interests of those who enacted them, and not the future stance of the church. Under Somerset the changes involved merely creating a Protestant facelift, and only under Northumberland did sweeping radical changes emerge. However, policy never hardened enough, or became accepted enough, to prevent it being disintegrated when Mary came to power in 1553.
The religious situation was highly unstable at the time of Edward's ascendance. Although Henry had allowed Protestant leaning clerics to predominate in the later year of his reign, most religious statutes remained orthodox, and conservative. But under Somerset Protestants who had previously fled to Europe after the six articles, such as Hooper, Becon, and Turner, all returned.
Many were writers banned under Henry VIII, along with Luther and other European Protestants. Guy points out that 159 out of 394 new books printed during the Protectorate were written by Protestant reformers.
Reformers predominated the Privy council under Somerset, and reform was popular amongst the gentry of the time. But outside London and East Anglia Protestantism was not a major force. In terms of religious hardening, it is unlikely that the surge of Protestantism had any particular long term impact outside these areas. It was only in these areas that violent iconoclasm took place. Elsewhere far more moderate reforms such as vernacular Bibles and services were introduced.
The legislation of the Somerset era also did little to aid a definite hardening of religious policy. The Privy council remained reluctant to make any radical...