Psychological Warfare & Deception.
Evolution merely places natural processes beyond “kinds”. Its not really that radical to think that organisms change over time into different forms rather then remain within specific kinds. It became a problem because the new information was exploited and expressed within the context of philosophical naturalism (the world view that supposes that all is physical and can be explained by physical processes), under the pretense that because the theory contradicted traditional interpretations of genesis, that therefore the bible was wrong. Even today, people make TV programs about the theory of evolution that include non-scientific information and opinion such as the idea that sciences greatest achievement was to disprove the teleological arguement. They are constantly glorifying evolution, not for the sake of the theory itself, but because they think it has over thrown what they desire to be superstition. Understandably its not a surprise then that Church Authorities were on the defensive given that science was so closely related to atheist ideologies; but it would be a fallacy to believe that all Church authorities and lay Christians were against evolution. If i understand correctly, Augustine had ideas that were not far from evolution. One must wonder then if the church was ever fighting evolution at all, but rather instead confusing philosophical naturalism with genuine science; which unfortunately lead to the rift between science and religion.
As far as i can understand, the Catholic Faith has always believed in the “natural world” and “natural processes”; but to what extent natural events explained things, is a question that wasn’t available until empirical science was shown to us. I would say that to believe otherwise would be boarder-line pagan. Those who had an agenda for atheism, exploited the superficial appearance that evolution had disproved Biblical Christianity, which in reality amounted to nothing more then a poor understanding of the authority and meaning of scripture and the unwillingness of many Christians to let go of traditional interpretations.
Had science not already been steeped in the historical, political, philosophical and traditional idea that science was in fact liberating us from the superstition of religion, i doubt very much that evolution would have been so controversial.
The greatest threat against Christianity is not science, but rather, it is ignorance, psychological conditioning, and the desire to disbelieve.
I bigger case could be built to support my position, but it would not be appropriate for a thread based forum.