The slaughter of a Christian if the name is not mentioned at the time of slaughter

Question:
Honorable Shaykh, may Allah grant you success. The questioner says: I am from Russia, and my wife’s father is a Christian. Is it permissible for us to eat from his slaughter, given that he does not mention any name while slaughtering?

Answer:
Yes, Allah has permitted us to eat their slaughtered animals, on the condition that they slaughter them according to the Shari'ah method: cutting the throat, severing the windpipe, and severing the esophagus. Yes, severing the esophagus and the windpipe, or the throat and the windpipe. That means you have four things: the windpipe, which is the passage for breath; the esophagus, which is the passage for food and drink; and the two carotid arteries, which are the passages for blood. If you cut all four, this is a complete slaughter. If you cut three of them, it is a sufficient and valid slaughter. Three of these four, whether the one who cut them is a Muslim or a People of the Book, his slaughter is permissible. Yes.