I mean,all the commands to celebrate the Jewish Holidays are in the Bible!
So why don’t they celebrate them too?
answer: those holy days were set for Jews. Christians have different holy days – Christmas, Easter (instead of Passover). They also don’t adhere to the 613 laws Jews were instructed to follow.
The Christians that try to overlay their religion onto Jewish holidays and rituals aren’t an answer either because they dishonor both religions and dilute both of them. Jesus celebrated Passover, he wasn’t PART of Passover. The holes in the matzo do NOT represent crucifixion wounds, etc.