Inside Tehran’s newest metro station, Iranians who can be imprisoned for owning bibles will soon walk past a plaque that declares, “the message of Jesus Christ was the salvation of humans from darkness, ignorance, corruption, depravity and discrimination.”Elsewhere in the Maryam-e Moqaddas station, or Holy Mary station, a relief of Christ walking on water decorates a vestibule, and his mother Mary is depicted, larger than life, praying among flowers. Estimates of Iran’s Christian population varies widely but a 2020 survey from the Group for Analyzing and Measuring Attitudes in Iran (GAMAAN) reported 1.5 percent of respondents identified as Christian. That...