Through Darkest Europe (previously announced as God Wills It) is an alternate history novel by Harry Turtledove.

[2] In this alternate world, the dominating Muslim cultures of North Africa and the Middle East are "liberal, tolerant, and above all rich."

Europe meanwhile is a hot spot of Christian fundamentalism, with assassinations, hijackings, and bombings committed by extremist groups such as the Aquinists.

Senior Investigator Khalid al-Zarzisi is sent to Rome with his partner Investigator Dawud ibn Musa with the mission of protecting the Grand Duke (monarch of all Italy), the impoverished Pope, and preventing European instability from affecting the First World.

Conversely, Al-Ghazali, who in the real world argued that Islamic faith was superior to philosophy and science, thought that the two were compatible.