This complete and in-depth study aims to expose and evaluate the philosophical understanding of Christianity offered by Immanuel Kant, who did not pretend to judge the truth of Christian doctrines, but used them extensively to build a “moral religion”. 

It addresses not only Kant's interpretation of various Christological dogmas, but also what the philosopher calls "the essential and most excellent of Christ's doctrine" namely, the explanation that ethical formalism proposes of the commandment of love to God and our neighbours, the peculiar Kantian interpretation of the Lord's Prayer and the philosophical exegesis offered by the Königsberg thinker of three famous verses from the Letter to the Romans: "Why not do evil so that good may come?", "All have sinned" and " It is God who justifies". 

Christianity interpreted this way is not, clearly, the religion of Christ's worship, but the religion of Christ's doctrine. While the first one is, according to Kant, a "second-hand religion," the second one constitutes its inalienable essence.