| A | B |
| Gnosticism | Denied Incarnation and appealed to secret knowledge for proof |
| monasticism | religious who live more or less secluded from the world, according to a fixed rule and under vows |
| Ecumenism | Promotion of the restoration of unity among all Christians |
| Deism | belief in a god who had no interest in creation |
| Arianism | A fourth-century heresy propagated by Arius denying the divinity of Jesus Christ. |
| Counciliarism | incorrect theory that councils, not the pope, hold supreme authority in the Church |
| Great (Eastern) Schism | (split) of 1054; led to creation of Eastern Orthodox Church |
| Feudalism | political and economic system of the early Middle Ages based on land tenure |
| Great Western Schism (1378-1417) | Began with Avignon Papacy; Multiple popes claimed power from 1378- 1417 |
| Protestant Reformation | October 31, 1517, Martin Luther (born 1483) nailed 95 Theses to the door of the Wittenburg church |