It always kinda reminds me of the whole history of how science came into existence (or rather, was lacking before it came into existence). Before the 1500's - 1600's, people were just as intelligent as we are. Still, it didn't produce anything much of progress or worthwhile knowledge because some ingredients seemed to be missing. Somehow, there was this idea that the Bible was... "enough". The concept that something could be learned about natural phenomenons/objects by observing them (questioning them, like by doing experiments) seemed to be in a "judo hold" by a reigning absolute trust in Divine Revelation. It was not a case of scientific endeavour being beyond their mental capacities. But more a matter of, if we talk in terms related to your question, not acknowledging the need or possibility to learn.
Hi,Af,I think there has always been a proportion of the population forging ahead with science. From Egypt through Greece and Islam into the Middle Ages, alchemists seem to have been permitted to experiment and learn. (maybe because of the profit motive to both sides?).
http://www.crystalinks.com/alchemists.htmlAlchemy - Wikipedia
De Re Metalllica shows that mining was widespread with all the technical and engineering problems that it entails.
AGRICOLA, GEORG (1494 1555)
Christian repression seems more concerned with heretical sects until Evolution gave an alternative explanation to the origin of life. Might have something to do with the biblical obsession with blood.