Encyclopedia Encarta states: "The doctrine is not taught explicitly in the New Testament, where the word God almost invariably refers to the Father. [...] The term trinitas was first used in the 2nd century, by the Latin theologian Tertullian, but the concept was developed in the course of the debates on the nature of Christ [...]. In the 4th century, the doctrine was finally formulated" [9] .
Bakit nag-alinlangan ang mga nagsisulat ng Catholic Encyclopedia sa pagiging papa ni Pedro? Kailan ba nagsimula ang tungkuling papa? Sa“Catholic Encyclopedia,”vol. 12, pahina 270, sinasabing noongikaapat na siglooikaapat na raang taon, ito ay pinasimulang maging katangi-tanging katawagan ng Pontipise Romano . Kailan naman namatay si Apostol Pedro?