The most likely transition is from Catharism to the Reformation, and from there to Protestantism.
I'm currently looking at information about Veininger. He has the following information:
After defending his dissertation, he converted to Protestantism.
However, there is no feedback in this transition. It would seem that we could dismiss this solution, but there is one but: somehow, it is impossible to create a more or less adequate clue with feedback from Veininger's Wikipedia page. There is very little specific information, and what there is seems rather general.
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