Question For Protestants

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How can all you protestants logically believe that the Reformation reformed Christian doctrine and worship that had become false and defective under the Catholic Church when there are so many different protestant denominations that espouse so many different beliefs/interpretations about various fundamental points of doctrine? Note that I am only referring to doctrine and worship and not about abuses, corruption and immoral practices of some Catholics including clerics, bishops and popes. And you need only examine conflicting doctrines preached by Luther and Calvin to see how early such disagreements arose.