Trinity Doctrine Defines Christianity Question details I thought that believing in the Trinitarian doctrine is what made someone a Christian? [Acts 11:26, John 14:8, John 16:12-13, Matthew 8:27, Mark 4:41, 2 Peter 3:18]. Play Share Copy 2020-05-13 Call length 9:06 Topics Topics Acts (Book) God (General) John (Book) Mark (Book) Matthew (Book) Son of God Trinity (Triune, Trinitarian) Christian (Christianity) Foundation (s) Following Jesus (Christ) Basics (Fundamentals of Faith) Nicaea (Council or Creed) Peter (2nd) References Bible references Acts 11.26 John 14.8 John 16.12 - 13 Matthew 8.27 Mark 4.41 2 Peter 3.18