Knowing God Personally
Christians and Muslims have many things in common. They believe in one God, worship in holy sanctuaries, have similar annual religious calendars, and set aside one day a week for a major community worship service. Outwardly both religions can look very similar. ... Formal monotheism – Is this really what God wants? A slavish commitment to repetitive ceremonies for as long as we live? A verse from the Bible shows how monotonous and ultimately meaningless this can be.

read;
Answering Islam, A Christian-Muslim Dialog and Apologetic