At the risk of alienating Catholics, Protestants, Muslims, and Jews all in one post (that would be a feat but likely more easily accomplished than one might think), I would like to suggest that perhaps God does not care as much about HOW we worship as we care or about how we worship as that we DO worship. On a regular basis, ecumenical questions arise in my prayer group or in general conversation among people in my parish, and I find myself defending Jewish and Muslim believers. Last week, I found myself doing the same thing in Jordan: defending Catholics and Jews.
Yes, there are significant differences in beliefs and practices among the Abrahamic religions, but we all do originate from the same forefather and the same geographical region. It would seem that we could, then, respect each other, if not love each other as brothers and sisters and worshippers of the same God whether we use the name Lord, Allah, or Yahweh.
The greatest irony, it might seem to others, is that it was a Sufi Muslim who started me down the path that led to the Catholic church. To me, though, it is no irony at all, for we are all God's people.