Why Islam has endured
Throughout its history, the Muslim majority world has faced many a crisis, both from within and without. Through all them, the Islamic faith has endured. Islam has endured as a source of comfort, strength, faith and spiritual renewal for more than a billion people. This is because of its message of peace and tolerance, love and brotherhood, faith and service, charity and altruism.
Yes, there are Muslim extremists who use Islam to justify their barbarism. Yes, there are some Muslims who do all the terrible things that people say "all Muslims" do. But, they are extremists, criminals and murderers. They do not represent the whole.
If you quote the Quran out of context, or misquote it, or quote some medieval text of Islamic jurisprudence, you can make Islam out to be the "cult of the devil." But it would no more represent the truth about Islam than pedophile priests represent the truth about the Catholic Church. It is an illogic of hatred. Would that more people see through this illogic and reject it.