Don;t get me wrong, I have no argument with Martin Luther’s stance against corruption.
Just realize that technically he is a heretic and Protestantism is heretical.
Also, the point was not about Martin Luther’s revolt against corruption, but to show that, like the original version of Christianity, it was derived from other religion(s) that preceeded it and was DESIGNED to be popular and win people over.  You take Nationalist pride elements, some things from earlier religions that have done well, stir until well blended, and VOILA!
When you trace the origins of Christianity, and compare it to various other religions that existed at the time, it is painfully obvious that Christianity was just a blending of existing religions with a few new elements.  And knowing that, and when looking at the story of the ressurection of Christ in particular and comparing it to the Mithraic myth cycle… well, the “truth” of it becomes a bit hard to believe.  I just don;t see TWO religions in the same area having identical tales of a ressurection, seperated in history by 300 years, and the LATER one is the Gospel Truth.  Far more likely, the later religion stole the entire myth and integrated into their own new religion (Occams Razor).
And if you acknowledge that the ressurection was a “myth theft”, then there is not a hell of a lot of “truth” left to anchor Christianity anymore, is there?