you would think so, but thats not the case. when a change is made to a prophetic religion that is not from a qualified prophet then it is by definition an incorrect change. this doesnt apply to evidence and theories in science since those never change the foundations of science. alterations of evidence and theories in science is what science is. prophetic religions can only do this when it is prophetic.
In the Catholicism case in particular, this is actually what Papal infallibility is all about. Mormons grant their leadership similar infallibility. Have the leadership of these two groups fucked things up in the past? Absolutely, so far as to have "infallible" Popes needing to correct doctrine created by other "infallible" Popes. It's a massive failing of organized Religion to think particular humans cannot err. But, this is how prophetic religions get around the very issue you've brought up and how the acceptance of theistic evolution was allowed to become official doctrine without critical rebellion in the Church.