Not so amazing. The most important day was the death of Christ. Many people had been resurrected by God through Christ. Without his atoning death, his payment for the penalty of our sins, his resurrection would have been merely a curiousity. It was his death that made his resurrection glorious. That is why he instructed us to remember his death:
1Co 11:26 For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come.
Naturally this occurred on Passover, one of the days that God ordained. Easter, like Christmas, is man ordained.
Easter is a creation of the Catholic Church. It is not mentioned in scripture.....Passover is. Passover is to be observed as a lasting ordinance for the generations to come, wherever you live. [Leviticus 23:14,21,31,41]
Polycarp, Bishop of Smyrna in the 2nd century, was martyred because of other things, his refusal to observe Easter. Polycarp insisted on keeping the Passover....150 years after the crucifixion. Polycarp was the disciple of the last living Apostle, John and I'm sure would have "got the word" if Easter was "the day".