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 .
Damnation
In most forms of Western Christian belief, damnation to hell is what humanity deserves for its sins. Catholic and many Protestant denominations hold that human sin is the product of the fall of man of Adam and Eve in the book of Genesis. In some Christian denominations, only the sins that the Ten Commandments describe cause damnation, but others apply more strict terms. The reasons for being damned have varied widely through the centuries, with little consistency between different forms of Christianity (i.e., Catholic or Protestant). "Sins" ranging from murder to dancing have been said to lead to damnation.
Christian denominations have differing views on soteriology, but a mainstream view is that believers can only escape damnation by salvation from Jesus Christ.