Purgatory

Purgatory is the belief invented first by the Roman Catholic Church (I think) where all those who die and have lived a mostly moral life or were below a certain age (See: Age of Innocence) will enter a realm where they will be punished to varying degrees, to "purge" them of sin so to speak so that they are "fit" to enter heaven. Many Protestants object to this belief on the basis of it not actually being explicitly anywhere in the Bible and that it seems to assert that one can enter heaven by being a good person, which is highly subjective by man's standards and impossible by God's. (Insert quote about "all have sinned and fallen short of the glory of God") Some Catholics may be instructed to pray for those who have recently died and are supposedly in purgatory, so that they would hopefully enter heaven faster.