As observed by millions of Christians around the world, Good Friday marks the day when Jesus Christ was crucified. For Christians, this event is the climax of sacred history: the death of Christ on the Cross is believed to have redeemed and cleansed the sin of humanity. Indeed, the efficacy of the entire Christian doctrine – adhered to by the largest number of people in the world – depends upon the event of the Crucifixion.
via The Crucifixion in Shi‘a Isma‘ili Islam | Ismā‘īlī Gnosis.