Does Chrisitanity have an original holiday?

All the ones I can think of were adopted from other beliefs. Is there one that has no other history from another belief? Many widespread customs associated with Christmas – such as Christmas trees, Santa Claus, mistletoe, holly wreaths, the custom of exchanging gifts – have pagan origins.

Christmas : Saturnalia

Easter : Ostara

Jesus of Nazareth : Apollonius of Tyana