The documents are the reason he is hiding for his life. On paper, Afghan law protects freedom of religion, but the reality here and in some other Muslim countries is that renouncing Islam is a capital offense.

Josef’s brother-in-law Ibrahim arrived in Kabul recently, leaving behind his family and business in Pakistan, to hunt down the apostate and kill him. Reached by telephone, Ibrahim, who uses only one name, offered a reporter for The New York Times $20,000 to tell him where Josef was hiding.

“If I find him, once we are done with him, I will kill his son as well, because his son is a bastard,” Ibrahim said, referring to Josef’s 3-year-old child. “He is not from a Muslim father.”