Capitalize in reference to all monotheistic religions. Also capitalize such references as God the Father, Holy Ghost and Holy Spirit. However, lowercase personal pronouns, such as him and he. Many Christians consider God to be beyond gender, so be sensitive to the context of the story and avoid gender-defining pronouns when appropriate. Orthodox Jews write G-d to avert the sin of erasing or defacing God’s name. Journalists should respect these Jews’ practice by using G-d in quotes of written material, but otherwise should refer to God.
REFERENCE: Religion Stylebook