An apples and oranges comparison, admittedly, but here goes:
Science is the means by which humans can understand how things work. As knowledge advances, ideas about how things work are adjusted.
The Org claims its knowledge is divinely given truth, therefore, it should be correct first time. However, the reality is the Org's 'truth' is constantly changing. The reality is that the Org's ideas are based on ancient writings that have to be interpreted ... by humans ... and humans change their minds and have different ideas on what the true interpretation should be.
Therefore, on what basis can the Org dismiss scientists for changing their minds in the light of more research when the Org does the same thing? If scientists cannot be believed because they keep changing their minds, then it logically follows that the Org likewise cannot be believed for the same reason.