Why do we not celebrate God's holidays and not man's?

Question

Are these not the true celebrations of God?
These are known as the feasts of Redemption, Revelation and Rejoicing :-

Pessach - Redemption

or Passover -

including Unleavened Bread and Firstfruits



Sha vu Ot - Revelation

The Feast of Weeks or Pentecost



Sukkot - Rejoicing comprising

The Feast of Trumpets

The Day of Atonement, Yom Kippur

Sukkot, the Feast of Tabernacles or Ingathering

Answer 1

These days are celebrated, by some churches.

.

Answer 2

NOt sure where you'e from but those holidays are celebrated