Christianity ruled the world and worked to destroy all opposition to its directives. This included anything that contradicted it’s interpretation of the Bible. Science found that the Earth orbits the Sun, not the other way around as taught in the Christian directives. So a war was conducted on Science and knowledge in general. This produced the era known as the Dark Ages. Libraries were destroyed, eminent scientists were forced into seclusion or killed. This set humanity back hundreds of years.
No doubt today we would have cures for nearly all of humanities illnesses if not for the Christian church. Flying cars, bases on the moon and Mars might have been a possibility by now as well. Who can know the advances we might have today if not for the ignorance proliferating even today promulgated by persistent allegiance to a dark ages product: The Bible.