[HiTech RedNeck]

I’ve heard some of the more horrible parts of the Inquisition came from flawed efforts of the Catholic Church to swallow Islamic peoples into its membership but not being too careful about what they believed. The result is that they still followed the Koran and were perfectly on board with medieval torture methods because of it. Of course Jesus was aghast.

[St_Thomas_Aquinas]

This is a 1994 BBC special about the Inquisition. In the last 25 years trial transcripts have been discovered and have changed the image of the Inquisition long held by historians. Don't let the Monty Python sketch in the intro put you off.