As Euro-American culture turns resolutely away from religiosity toward spirituality and becomes increasingly post-Christian, the ordinary, everyday practice of Christian life is ever more questioned and in need of scrutiny. In this interdisciplinary analysis, Christians are first called to comprehend the excessive rationality that modernity has built into both the cognitive and organizational structure of contemporary Christian life. They are then summoned to personify an authentic attitude of humility, and in particular, the virtue of intellectual humility that is most challenged and tested by religious convictions. Going forward, Christians are subsequently invited to live their faith more as an internally differentiated and open spirituality, rather than an externally determined and regulated religiosity. When we exhaust our rationality and are confronted with its limitations, we are humbled by our finitude and animated by our spirituality.