"The Green Pastures" is a 1930 American play, and 1936 Hollywood movie, that was once as famous as "Our Town". Now, for reasons of political correctness, it is rarely seen and seldom taught. Even the DVD has to carry a 'Warning' label. (Good Grief!)

Marc Connelly's "The Green Pastures" deals theatrically with the transition in the Bible from Law to Grace. (It is not Marcionite!)

Has God's Mercy, in relation to God's Law, ever been staged like this?

I can't think of an example.

You've got to see "The Green Pastures". The character 'Hezdrel', alone, will... blow... your... mind.