Continuing with information from the article "Common ground?" by Stephen Adams in the March 2008 issue of Citizen magazine, Dr. Patrick Sookhdeo, a Muslim expert and international director of a Christian ministry to Muslims, said "the Yale letter is part of 'an ongoing process where the world of Islam will seek to neutralize Christianity'" (pg. 20).
The title of the Muslim's letter to Christians, "A Common Word," comes from a verse in the Quran. According to Dr. Sookhdeo, who is an Anglican priest and a former Muslim, the verse "has always been understood as a call to deny the Trinity and the deity of Christ."
You can read Dr. Sookhdeo's complete analysis of the letter from the Muslims. Find his paper, "Response to Open Letter and Call From Muslim Religious Leaders to Christian Leaders, 13 October 2007" here: