As I read through the OP and the subsequent responses, what comes to mind is what I've written below. I don't mean to sound like I dragged out the soapbox...or that I think I'm some sort of standard. I'm not. God's word is the standard, fleshed out in Jesus. This is just how I put the pieces together, and you are welcome to read on for what's it's worth.
Along the same lines as the post above, I've often wondered why the Church/the believers found it necessary to replace the God-assigned annual celebrations with an emphasis on celebrations that looked like their pagan roots. It reminds me that a man convinced against his will is of the same opinion still. But if we begin to think that we can worship God in any way that we choose, isn't it a little (or a lot) like Aaron's sons with the strange fire? Could we re-write the other 9 Commandments and think God was OK with lying, adultery, dishonoring parents, stealing?
It's clear that as a culture we the believers collectively historically got into a place where our own rules trump what God clearly told us to do and started doing things He clearly told us NOT to do, and the majority are still doing it. As for me, I repented. It is the closest thing I can do to an apology. I simply choose not to behave in those ways. I was raised with all the standard American holidays, but in addition to being empty, I now reckon them to be outright wrong. Because God gave me control of this life (it's called self-control, fruit of His Spirit), and out of deep respect for the love with which He loved me, I choose not to murder/I monitor my heart against hate and disrespect, and I choose not to commit adultery/I monitor my heart against lust. In that same way I add all diligence to respond with a heart intent on obedience to the best application of His law all the way through every aspect of my life from my heart. His law defines righteousness, and in Christ He has made me righteous. To do less would be to disrespect this wonderful salvation. I have not been reckoned by God to be righteous in order to continue deliberately missing the mark.
Oddly, this message is often perceived as rebellious and divisive. I find that interesting. We do have a strange culture in the Church and in America. But I don't have any control over what anyone else is thinking or saying, and if they are going in a different direction than what I see from what God says, I can't go that way. When I started separating out what I had been taught by churches/man from what the Scriptures say, I found I had to set many ideas aside. It became apparent that I am responsible for the beam in my own eye to work on fixing it, my own answer of a good conscience towards God, my own acts of obedience to what He clearly spells out, and maintaining my own jars of oil and lamp when the Bridegroom comes. We'll find out on that great day whether it was the right way to go, but it's the closest to that narrow way Jesus told us about that I've found.
One of the mushrooming effects of religion of every kind is when we set our own brains aside to have some sort of approval into a group and it does indeed become an opiate of the masses. It's so sad. God wants that relationship with each of us, not some sort of nod in His direction and then on to what the group decides. The way I add it up, the OP was a call to see that and repent - individually. It would likely not be possible to do this as a group or we'd just be perpetuating the situation for the next huge error. There is no US against THEM. There wasn't for the Pharisee, and there isn't for US. We are all the sinner head down asking for forgiveness - that is, if we want the justification that Jesus said the sinner received from God.
No soapbox here. I do offer any encouragement to believe Him and walk with Him according to how He told us and share the encouragement around to anyone who will hear it. What a precious opportunity He's given us to walk in His Spirit!