Of course, you should go through the word of God with them, spend time reading it with them showing what it really says. That's really the only solution to show how what they assumed was not true. But after you have done a pretty good job of explaining everything and still not response. You got to kick the dust under your feet and move onto the next Muslim to see if he hath an ear to hear.

What did I say that you thought was more than what the Qur'an said for the Muslim?

Darby was correct. Why are you offended by dispensations of time? Surely you don't think the age of grace was the same as the age under the law?

There is the Abrahamic Covenant, the Old Covenant of the Law with the nation of Israel, and the New Covenant in the dispensation of grace. There are several covenants below these major ones.

Age of (eah with its unique characteristics or dispensation):
1. Innocence - Adam
2. Conscience - After man sinned, up to the flood
3. Government - After the flood, man allowed to eat meat, death penalty instituted
4. Promise - Abraham up to Moses and the giving of the Law
5. Law - Moses to the cross
6. Grace - The cross to the Millennial Kingdom
7. Millennial Kingdom - A 1000 year reign of Christ on earth centered in Jerusalem

Just looking at your profile, you don't agree with the premillennial view which shows you are don't accept sound doctrine. How are you any different?