and
Both of you are making similar points so let me address them together.
The main thing to keep in mind is that there is no such thing as monolithic Islam. Some of your points are valid about the Wahhabi interpretation of Islam, but not the more moderate, mainstream versions, including the Sufi version.
The other thing to acknowledge is that the integration canard is a recent furphy thrown up by the bigots. Various groups integrate to varying degrees and, as long as people obey the law and don't do harm, nobody minds. Also, lack of integration is a two-way street. There have been studies by the BBC in Britain and France which show clear job discrimination against resumes with Muslim/Arabic names. High profile demagoguery by the media and politicians against Muslims also doesn't help integration.
As far as terrorism goes, it won't go away until the root causes go away. And those causes have nothing to do with integration. They are far away in the Middle East and elsewhere. As long as Western/Israeli armies continue to kill Muslims, there will be resentment and retaliation.