This quarrel over the messianic status of Jesus within first-century Judaism had profound effects on Christianity and prompted it towards a fateful turning point that switched the emphasis from following the way of Jesus to believing things about Jesus. Gradually a Christian came to be thought of not as one who lives and acts in a certain way, but as one who holds certain convictions or theories. The trouble with religious convictions or beliefs is that, since we can rarely prove or disprove them, we get anxious about them and start quarrelling with people whose convictions or theories differ from our own.
Richard Holloway, Doubts and Loves: What is Left of Christianity
christianity, theology