Scientific progress in the Dark Ages?

This is false. On the contrary, the Church was one of the main driving forces of that time.

One example is the Venerable Bede who lived until 735AD was, as well as a historian, an astronomer. He taught, amongst other things, how to calculate the calendar and how the Universe could be described as a series of classical spheres etc. Nobody tried to suppress him and his writings were disseminated widely across Europe.

Another example is that in Greek, Roman and Islamic culture, the dissection of human bodies was taboo, with the result that medical research had to rely on dissecting animals which led to mistakes. It was not until 14th century Italy that human dissection became a part of medical education and the mistakes made by the ancient Greeks were uncovered. Far from suppressing this, it is likely that the first dissections were legal autopsies which were ordered by the Church directly.

Thomas Bradwardine in the mid 14th century was discussing whether the Universe was infinite or whether there were actually an infinity of Universes. The idea of the multiverse was proposed in the Middle Ages by a man who became the Archbishop of Canterbury!