Written at the dawn of secularism’s rise, this prophetic work by Cardinal Jean Daniélou warns that Christianity’s survival depends on rebuilding a truly Christian people — not just resisting elite ideologies but re-evangelizing the masses. While others celebrated Vatican II’s optimism, Daniélou sounded the alarm about the creeping de-Christianization of society through technology, atheism, and spiritual indifference. He argues that Christian civilization can only flourish when the Faith is deeply rooted in public life and that the Church must create strong communities where prayer and vocations can endure if society collapses. This powerful book is both a diagnosis of our modern crisis and a call to action for preserving the spiritual and social foundations of Christendom.