Is this a dumb question?

Watching a movie called "Last Holiday" with Queen Latifah. (Mom picked it out; I'm finding it a bit dull, tbh.) Her character finds out from her doctor that without a certain operation, she's going to die, but her HMO won't cover it. Cut to her in church, singing what's on her mind, and the choir and everyone else just repeating everything she says.

WTF is that? Is that a thing that happens in Black churches? Never been to a church where that happens, even those crazy Pentecostals.