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The Catholics took the festivals of pagans and made up stories about why they were now celebrations of Jesus.

These reasons were all pulled out the ass for the purpose of co-opting the festivals that were being enjoyed by the local populations, events that they were reluctant to let go of.

So the church found a way they could practice a fearival for a pagan God, while pretending they were celebrating Jesus and his pals in the Christian gospels instead.

For example, Samhain was remade as Halloween, or "all saints day", because it was a day for honoring the saints.

All of these events were lazily pasted over with a thin veneer of Christianity, and these hackjobs were done with such a low level of effort that the pagan nature of the "holiday" is clearly evident and Christians simply pretend not to see it.

In Easter's case, this extends even to the name of the occasion.