I doubt that this was his main "crime". He was a former monk and priest who denied central Christian doctrines like Jesus being "God's son", final judgment and afterlife.

This he justified with his scientific views. He traveled most of Western Europe and managed to alienate Catholics, Calvinists and Lutherans alike with his harsh polemics.

Galilei was actually one of his successors at a university post, and might have suffered from the resulting purge against "new scientific views".