If you took Jesus' teachings and stripped the name off, would most of these people agree with them? Things like welcoming the foreigner and treating them as one of your own, not judging others, etc.?
I don't think using the name and trappings of a religion as a cultural label and dog whistle is the same as sincere belief.
They sincerely believe what they consider to be the teachings of Jesus. They aren't just using the name and trappings of a religion as a cultural label.
You can call them hypocrites, and maybe that's fair (most Christians are) but they are sincere.