This might not be the right place to ask this question but I figured it was as good as any. I was raised by a Jewish father and Presbyterian mother, and as such we celebrated both Christian and Jewish holidays. I attended church school but was also Bar Mitzvahed and as such have been relatively well educated in each religion, enough to know that holidays like Passover and the events which it celebrates are recognized in Christianity. So if Christians recognize the exodus of the Jews from Egypt and all of the related events as miracles, and if Jesus himself celebrated this holiday, why isn't Passover or any other Jewish holiday recognized by Christianity not celebrated by Christians?
The majority of Jewish holidays come from Rabbinic Judaism, which became dominant during roughly the same time as the rise of Christianity. It has its origins in Pharisaic Judaism. In the Gospels, you will see Jesus at odds with the Pharisees fairly often.
The bread and wine in the Eucharist have their origins in Passover. Without getting into transubstantiation (since it's not relevant here and rejected by your Presbyterian background), the reason why the (traditionally unleavened) bread and wine represent the body and blood of Christ, rather than other food and drinks, is that those are the foods most associated with Passover, so in a sense, Christians commemorate Passover every Sunday.
I'm not sure of the reason why the High Holy Days aren't recognized in Christianity.
AskHistorians has had questions like this before but:
To clarify: many religious groups that fall under the banner of Christianity DO recognize one Jewish holy day directly in the form of Pentecost (or Shavout). Also, Holy Thursday (remembrance of the last supper) captures some of the historical significance of Passover, as the last supper took place on that day.
Really though this all sort of boils down to early Christians placing emphasis on the "New Covenant" over the "Old Covenant". Over the early centuries of Christianity there was a growing recognition of Christians as a distinct group, with a focus on the teachings of Jesus, and as such those groups placed more importance on Easter/Good Friday rather than Holy Thursday/Passover.
Mostly pulling this from things I picked up taking required religion courses in College, though we used "A short history of the early church" by Boer, if you're curious.