DD those quotes are from the Haddith, not the Qu'ran. You should have checked the references on the Wikipedia page, as it would have told you say that the first quote about Damascus is from Sahih Muslim - one of the Haddiths. 

If you go back and re-read my essay, you will see I am not advocating Christian missionaries promote or accept a version of Islam that we usually see around the world, that reads the Qu'ran through the Haddith.  

It is the same with Judaism and the Talmud. Messianic Jews wouldn't I believe accept the Talmud.

My understanding is that "insider" Christians instead spread the gospel to Muslims in their lands, often under pain of the death penalty, by reading the Qu'ran through the prism of the Bible - as the Qu'ran itself acknowledges the Bible but not later supplements like the Haddith.