Despite being qualified to preach, Latreille later wrote that he had never carried out his functions as a minister, although for a few years he signed the letters he wrote "l'Abbé Latreille" ("the Reverend Latreille") or "Latreille, Prêtre" ("Latreille, Priest").
Nepaisant to, Latreilis vėliau rašė, jog niekada neatlikinėjo dvasininko funkcijų, nors kelerius metus ir pasirašinėjo savo laiškus kaip „l’Abbé Latreille“ (Šventasis Latreilis) ar „Latreille, Prêtre“ (Latreilis kunigas).