Hello Moses,
I liked how you interpreted the question to mean what areas can we tackle together with our Muslim brothers and sisters. Regarding the intermarriage point, I’m not sure if I understand you. Are you saying Muslim females should be able to marry Christian men and vice versa? Christian men or women should be able to marry Muslims? The Scripture is pretty clear that Christians should not be unevenly yoked. This, of course, allows for the scenario of one who is already married before becoming Christian to remain with their unbelieving partner. However, I agree with your other point that we can work with Muslims on the freedom of religious practice in a majority Islamic state, as Muslims are allowed to practice their religion in Christian-majority countries.