This clip comes from the film, Luther, and portrays his courageous decision, early in his career, to defy the teaching of the Church of his day that suicide was a mortal sin. Because of that teaching, the victims of suicide, of what Luther called "despair," were not buried in church graveyards. But Luther said that God is a God of mercy and love Who is "friendly."
And yes, Luther called Satan a shit. Who better to wear that title?