The Christianity that was spread across Europe during the middle ages was based on the scriptures that recounted the life of the Christ and his disciples. The Christian Church had its own lands, laws and taxes. The Church was so influential that it too collected taxes from its followers. Emperor Constantine also tried his best converting everyone to Christianity
The answer is pseudo listening. His grandfather was hurt because Derrick is pretending that he listens to his stories but in fact, Derrick finds these so "boring". Derrick does not want to hurt his grandfather that is why he acts as if he is really listening. Pseudo-listening is the term when an individual partially or totally ignores the speaker but not act rude to avoid hurting his feelings.
It teaches about the Lord (God Jesus etc.) mainly. But it also is on the head lines of just teaching normal scincey stuff!
