The exisitence of Moses is not as crucial to us as the existence of Jesus to you. We do not worship Moses. We do not make graven images of Moses.
The year is not important, the event is.
The crucifixion is supposed to have happened in an era when record-keeping was much better than it was in the time of Moses. We have documentation for the year of the death of Herod the Great but not that of Jesus. Luke knows the year in which John the Baptist began his ministry but he does not know the year of the crucifixion.
The year, in itself, is not important but, if it had actually happened, the early church would have remembered when it happened and commemorated that date. As it is, the church merely celebrates Jesus' resurrection on the pagan fertility holiday of Easter (Ashtoreth) when pagans believed nature was resurrected.