What's wrong with probability?

At his trial, Galileo defends himself by claiming that his dialogue merely entertains the existence of the Copernican system. Galileo states that he never explicitly endorses either position; rather, he presents the two major systems and leaves them "unresolved." The Inquisition, however, asserts that Galileo was wrong in the first place for even entertaining the Copernican system. In the final verdict, they state that "for in the same book you have defended the said opinion already condemned and so declared to your face, although in the said book you try by means of subterfuges to give the impression of leaving it undecided and labeled as probable; this is still a very serious error since there is no way an opinion declared and defined contrary to divine Scripture may be probable" (289). Why is Galileo's "hypothetical" situation punishable in this situation. If his system is presented as he states as merely a hypothesis, how is this a violation? Does the Inquisition just wish to have any reason necessary to prevent the publication of his book from influencing more minds?