In France, for forty years, began an estimated settlement migration today to millions of people belonging in their quasi totality, to the Muslim religion. Such an influx of this category of foreigners, had never occurred between the two previous wars with the arrival of our Spanish neighbors, Portuguese, Italian ... It will inevitably lead to fundamental changes in the composition, nature and the institutions of the French nation, Islam is very different and even opposed to the values of Christian civilization to which we all belong. This immigration, settlement, took place gradually, insidiously, without the knowledge of the electorate, the subject had never been mentioned in the programs of the candidates to the various presidential elections. To welcome and integrate newcomers, huge sums have been spent, including what is called, euphemistically, Department of the city, ranging unthinkable decision to build, in most cities, mosques, which became, as was to be expected, as many proselytizing venues. This immigration, as everyone can see, is far removed from this "opportunity for France" and enriching contribution of this "diversity" originally presented, the stumbling block, not envisaged by our leaders, essentially religious: Islam. During the first three quarters of last century Islam was somewhat asleep. It was not the major element in the struggle for the independence of countries like Algeria. With the fall of the Shah of Iran in 1979 and the establishment of the Islamic republic by Ayatollah Khomeini, he regained the strength that was his before and in its infancy. In today's knowledge of the nature and history of this religion is essential for understanding the events unfolding before our eyes. Unfortunately audiovisual media misrepresent and toned image. Thus it is always used purely journalistic expressions moderate Islam, Islam in France ... who not only do not match the rules of the practice of worship, but that may be for some Muslims, placed the limit of heresy. In other circumstances, alas drama, fear and cowardice, we refer to pasdamalgame for not using the word "Islam", to clearly identify the true motivations of the bombers. Then employs strangely synonymous: Islamism, meaning variously, Larousse, the doctrine of Islam or Islam itself, who are made to wear all bloody and harmful action of Islamic terrorism. This introduction to show the great interest of the particular book, relevant, enjoyable reading, as well chosen, Laurent Lagartempe, first in the history of the origins of Islam: true nature of the legendary Prophet Muhammad, composition, Analysis and demystification of the Koran causes of military rise and victories of the first Muslim armies, double language and tactics dissimulatrices this totalitarian religious system, intolerant, rigid and stuck in blind obedience of the Koran and finally expansionist aims of the Islam in France and Europe. All this being the synthesizing work of contemporary researchers: J. Bertuel, B. Bonnet-Eymard, Mr. Cabantous, P. Crone, E. Clear, E.-M. Gallez, H. Lammens, D. Masson, A. Moussalli, A.-L. Prémare, G. Thery, D. and M.-Th. Urvoy. This book is dedicated: "To all Muslims who aspire to overcome the Koran and friends" For complete documentation on this vast subject, I recommend reading two books by the same author: Basic Guide to the Koran and the Koran against the Republic. Incompatible verses.