From the 1927 Paramount release book
"The famous character star in his first American picture, a powerful picturization of the original story by Bruce Barton, author of 'The Man Nobody Knows.' The event of the season!"If this title seems unfamiliar, don't worry, it's not lost, it simply doesn't exist. Promoted to theatre bookers as German great Emil Jannings' first American picture, that project would eventually turn out to be The Way of All Flesh, which earned him the first Academy Award for best actor, and also turns out to be the only Academy Award winning film for which no known print--aside from a few fragments--is known to exist.
The Man Who Forgot God is like Paramount's silent War of the Worlds, it doesn't seem to have made it past pre-production. Great artwork though.