Bultmann was never ordained but he was frequently asked to preach and he was always active in the life of the Lutheran parish in Marburg. It was his task to stand at the door with the poor box and receive offerings as congregants left the service on Sunday morning. And he took this job seriously and performed it every Sunday he was in attendance (which was every Sunday he wasn’t elsewhere lecturing or preaching).
He was, to put it bluntly, a better Church member than the Fundamentalists who assail him without cause.
If you have never read any of his sermons, find a copy of this book and read them. You won’t regret it. You will regret it if you don’t, though.