I am all for dialogue between Muslims and Christians when it is honest and not based on false pretenses. There doesn't seem to be any use to dialogue that ignores difficulties and points of disagreement rather than confronting them. They won't go away if ignored. I discuss the genuine prospects for dialogue and its pitfalls at length in my book Not Peace But A Sword, which will be published next week by Catholic Answers.
One thing that must be recognized is that for many Muslim spokesmen and leaders, dialogue with adherents of other religions is simply a proselytizing mechanism designed to convert the "dialogue" partner to Islam, as the Muslim Brotherhood theorist Sayyid Qutb explained: "The chasm between Islam and Jahiliyyah [the society of unbelievers] is great, and a bridge is not to be built across it so that the people on the two sides may mix with each other, but only so that the people of Jahiliyyah may come over to Islam."