Human beings are usually related to God in two times: first we face the evils that afflict us; And, in a second moment, we postulate its existence so that it remedies them in a future world, beyond the death. In this way, evil is, almost at the same time, the great objection against God and the condition of possibility of its existence. It seems impossible, in view of so much suffering, that there is a good and all-powerful God; And it would be terrible, in view of so much pain, that there was no such God. It is Pascal's: "It is incomprehensible that there is God and incomprehensible that it does not exist." It is, in the words of José Gómez Caffarena, "the dramatic balance between the yes and the no" to the Christian faith. This book deals with the avatars of belief in God and is divided into five distinct parts. The first contains four autobiographical texts, but in which philosophical-theological information predominates, the theoretical pronouncements on religious fact and, above all, the grateful evocation of some teachers and friends. The second part offers the text of the XXI Conferences Aranguren pronounced at the Higher Institute of Scientific Research in June 2012. They analyze the current rise of religions and the apparent eclipse of God. The third part opens to five horizons: Jesus of Nazareth, life after death, evil, spirituality and hope. The fourth part consists of studies on three great teachers and dear friends: J. Gómez Caffarena, H. Küng, and W. Pannenberg. Finally, the fifth part of the book includes the articles that the author has been publishing in recent years in El País newspaper. Some readers had expressed their desire to have them "together" in a book.