I’m a little surprised by the “come to Jesus” one, as I’ve even heard that in TV shows. The reason I posted it was because my manager’s manager said it in a group meeting earlier this week. He was late joining our meeting and said he’d “…just had a come to Jesus meeting with <his manager>.”
I do think there is a somewhat similar saying in the UK - “home truths,” like “I’m going to tell you a few home truths!” - I’m about to tell you something about yourself, and you’re not going to like it.
We used to watch Eastenders when we lived there (gritty UK soap) and I think that phrase was said in just about every episode!