Other than the second chapter, actual epistles from Jesus crucial to understanding how He looks at things, what difference does it make, ideological or otherwise?
“I am a better Christian than you” may not be as important as the question, “Are you a Christian?” An affirmative answer to the later, as I understand it, suffices.
Am I a Christian? In the words of Jesus “he that is not against us is for us”. Are you St. Peter, checking immigration status of those entering?