Eternal sin
In Christian hamartiology, eternal sins, unforgivable sins, or unpardonable sins are sins which will not be forgiven by God. One eternal or unforgivable sin (blasphemy against the Holy Spirit) is specified in several passages of the Synoptic Gospels, including , , and .
Christian denomination
Christianity has not been a monolithic faith since the first century or Apostolic Age, if ever, and today there exist a large variety of groups that share a common history and tradition within and without mainstream Christianity. Christianity is the largest religion in the world (making up approximately one-third of the population) and the various divisions have commonalities and differences in tradition, theology, church government, doctrine, and language.