Uwe, you put words to something I've felt for a long time. It's very creepy indeed when people are forced or intimidated "group thinked" into performance. I've never trusted it, and that's one reason I tend to shrink from musical performance at churches or religious ceremonies. It's too close to a form of propaganda. But I do attend the Christmas concert at a church when a number of my friends play in the band, as it's sufficiently non-specific-dominational enough for me to enjoy it.
"I’ve never understood how God could expect his creatures to pick the one true religion by faith—it strikes me as a sloppy way to run an organization, whether a universe or a smaller one." - Robert A. Heinlein, Stranger in a Strange Land
“Come Judgment Day, we may find that Mumbo Jumbo the God of the Congo was the Big Boss all along.” - Robert A. Heinlein, Stranger in a Strange Land