This account of ecclesiastical history is not in fact historical.
You are conflating the discredited Roman Catholic practice of selling indulgences for the benefit of the deceased, from the early Renaissance, with the persecution of the Christian Church by the Roman Empire pre-Constantine, the Council of Nicea, and later events, and in so doing are ignoring the hard facts of the matter. For example:
- Rome persecuted Nicene Christians from the death of St. Constantine until the 390s.
- The Western Empire, including Rome, fell around AD 600, and was later subjugated by the Franks, who founded the so-called Holy Roman Empire, leading to the Orthodox-Catholic schism.
- Iconoclasm was an official policy of the Byzantine Empire, in which icons were smashed and their defenders exiled, tortured and killed. It was later abolished, however, iconoclasts were never killed or maimed in the manner you suggest.