The real evidence for Jesus and Christianity is in how Jesus and the Christianity based on him manifest themselves in the lives of practicing Christians.

Blue’s remark shifts the “proof” of Christianity away from abstract argument—historical apologetics, metaphysics, or institutional claims—and toward lived witness. The credibility of Jesus, on this view, is tested pragmatically: what kind of people are formed by devotion to him, and what kinds of communities and moral habits emerge from Christian practice? It also implies a critique: Christianity is most vulnerable not to intellectual refutation but to hypocrisy, cruelty, or spiritual emptiness among its adherents. Coming from a Jewish commentator, the line can be read as an outsider’s criterion for evaluating Christian truth-claims: not by accepting Christian premises, but by observing whether Christian life manifests compassion, integrity, and transformation.