I observe Christmas and Easter to celebrate the Nativity and Resurrection of or Lord, Jesus Christ, respectively. That’s why.
Have you ever heard of the Judaizers? They were folks mentioned in the Bible who thought Christians needed to be Jews first, even going so far as to demand converts be circumcized, in order to be saved. Your thinking is the exact same thing, minus the circumcision, apparently. You seem to think that in order to be true Christians, we need to act like Jews. News flash; we don’t.
I suggest you actually research Christian history and theology and then get into a REAL Christian church. I have a recommendation of one; it’s based in Rome and has over 1.3 billion members =3
Oh. I observe Passover because Christ, our Passover died for us. I observe the feast of unleavened bread because it pictures our journey out of sin, spiritual Egypt. Observe Pentecost because it pictures the formation of the church of God. You get the idea.
Who decided your days were better than the bible days?