A good article at CT: The Real Theological Issue Between Christians and Muslims It's not about a different God, it's about a different Jesus, by Duane Litfin.
[On the same God? issue…] One reason opinions flew in every direction is this: That question is not only unhelpful but perhaps worse than unhelpful. The question appears incapable of generating a satisfactory answer, and when well-intentioned people try to answer it anyway, as they often do, the typical result is turmoil and confusion…
Understanding what Islam and Christianity do and do not hold in common is an important task, but asking whether Muslims and Christians worship the same God will not get us there.
Litfin argues in a similar way to how we have approached this issue in the past. See Is Allah God? A Relevant Issue?
From the conclusion:
Yet it is critical to remember that this is a missiological, not a theological consideration. We must not confuse or conflate these two contexts. Points of theological similarity between Christianity and Islam can be useful in friendship or missionary settings, but citing these points as if we think they actually count for something with God apart from the gospel is a grave mistake.
Christians do their Muslim friends no favors by so emphasizing points of similarity that Christ’s ultimate verdict is never heard. The decisive question God asks of every human being is: What have you done with my Son? (John 1:10–12) If the answer is that we have refused him, nothing else we say can matter. As the rising sun overwhelms the nighttime stars, so the refusal of God’s gift of his Son renders every other claim irrelevant.
In the preface to The Great Divorce, C. S. Lewis famously said, “I do not think that all who choose wrong roads perish, but their rescue consists in being put back on the right road. A wrong sum can be put right, but only by going back till you find the error and working it afresh from that point, never by simply going on.” So it is with the reception of God’s Son. Until we get that fork-in-the-road decision right, all else becomes moot. “Whoever does not honor the Son, does not honor the Father who sent him” (John 5:23).