The true-story drama, about an evangelical minister, will be directed by Joshua Marston of 'Maria Full of Grace'.
Ejiofor is in negotiations to portray an evangelical minister while Redford is set to play Oral Roberts, said The Hollywood Reporter.
"Come Sunday" revolves around the story of Carlton Pearson (Ejiofor), a renowned evangelical minister in Tulsa, Oklahoma, who stirs up controversy with his statement that there is no hell. He loses everything and must rebuild his church and his family and find his own personal faith.