"In sum", Riessen wrote, "both for Sloterdijk and Cliteur, monotheist religions are not judged in their own right, but merely evaluated according to their ability to restrain the existential rage of their more extremist followers." In "Critical Quarterly", Steven Connor described the book as an elaboration of Sloterdijk's "Rage and Time", published in German the year before "God's Zeal". Where the previous book describes the connection between religious and revolutionary rage, "God's Zeal" covers "the persistence and even revival of religious affect and motive in the modern world". Connor wrote that Sloterdijk's work is important because it allows a "radical critique" to exist outside of the "monopoly" of "philosophical supremacism".