He really had NO idea that he was the cornerstone of a reformation of any kind, let alone the cornerstone of the plethora of Protestant denominations. There isn't much to protest any more vis a vis the Catholic Church. I hope he's in heaven.
By the way, I'm Catholic.
I feel bad too, that Luther acted from a very bad case of scruples. Luther does not sound to me to be a really bad apple, like say Henry VIII. Luther did not behead his wife (Anne Boleyn) on made up charges which are so disgusting (adultery, incest).
So Luther never stuck me as someone who was evil. There are two things which I hated which he did. First Luther giving permission for Phillip of Hess to engage in bigamy and then ordering him to cover it up, and the second thing is Luther’s anti-Semitism, which was far worse than almost anyone at the time, and it was an anti-Semitic time.
And I am Catholic too.