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What would the effects have been if Mary had gone along with her father's break with the Roman Church or been a strong Protestant like her brother Edward?
I could see two strands off of this, one being that she simply supports the Anglican Church much as Henry VIII or Elizabeth did and the other being that she's as fanatical as in OTL but for the Protestant rather then Catholic faith.
How could she move away from the Catholic Church prior to taking the throne and what would be the effects of this?