This is true, and if you don't hold to EP, it is almost as impossible on the holy day question, though you'll find hymn singing churches that don't observe them and you will find EP churches that do. I go to a PCA, don't sing the hymns or do the unison readings. When I transferred 15 years ago I discussed it with the session and they were okay with that. But we sing probably 70/30 psalms/hymns having long been a psalms priority congregation, to the extent we produced our own psalter to use. You'll find some churches not okay with members who don't participate in some aspects of their services, who will immediately or someday in indirect or more direct fashion, show you the exit door.I guess one thing I would mention is whatever your conviction is, finding a church that is Psalm only and no instruments in some places is going to be borderline impossible. I don't think there is one in my state. PCA and OPC churches don't hold to that for the most part and they also celebrate Christmas and Easter. I see many of your defending the RPW and the conditions I mention above, go to PCA or OPC church. My question is what do you do in your worship services when they do hymns and play instruments? Do you not participate? Or, do you actually attend one that holds to the principle fully as you explain?