 Christianity is an Abrahamic monotheistic religion, currently the religion with the most adherents. It developed in the first century CE out of Judaism. Christians adhere to asserted revelations described in a series of canonical texts, which include the Old Testament, which comprises texts inherited from Judaism, and the New Testament, which contains the Gospels of Matthew, Mark, Luke, and John (narratives on the life and teachings of Jesus), as well as events and teachings of the early Christian churches (e.g., Acts of the Apostles, letters by Paul), and Revelation, a prophetic book on the end times.