The Catholics invented the trinity when they were Paganizing the teachings of Jesus. They were sneaking polytheism into the back door under the guise of the trinity. With the concept of the trinity, three Gods magically become one. Many details found in later writings, such as Matthew and Luke do not appear in the earliest manuscripts of Mark, including the phrase "Son of God" at Mark 1:1. The letters of Paul the Apostle, for example, do not mention a virgin birth of Christ. Paul describes Jesus as "born of a woman, born under the law" and "as to his human nature was a descendant of David" in the Epistle to the Galatians and the Epistle to the Romans.
Trinitarian heretics repent!!