There have been a lot of greek myth Gods depicted in film. Which film was the first to show us the face of the Christian God Jehovah?
The earliest reference I could find is The Green Pastures (1936). The story relates "portrays episodes from the Old Testament as seen through the eyes of a young African-American child in the Depression-era South, who interprets The Bible in terms familiar to her." The film is based on the 1930 play of the same name.
The next one I could find is The Old Grey Hare (1944) in which the titular character is the beloved Bugs Bunny and the voice of God was provided by Mel Blanc, famous for doing the voices of Bugs Bunny and many other Looney Tune characters.