Deuteronomy 12:30
It’s what I have been trying to say. “Don’t look at how they served their gods and think that you can serve me in the manner they served their gods.
Look at how that chapter ends in verse 32 which simply enforces what He is saying.
32 What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.
Even if people today try to claim we are to follow the Old Testament “ordinances” (which Paul clearly denounced in his letter to the Colossians – see my post 317) they would still have to show where God commanded or sanctioned either Christmas or Easter. We are not obligated under the old “ordinances” nor are we to incorporate heathen/pagan practices which He didn't command or sanction.