Many Christians vehemently disagree that the Muslim god is the same as theirs. What a bunch of academics have to say on the matter is irrelevant; religion is just someone's personal belief and completely unfalsifiable, so you can't say they're "wrong".
No, I'm criticizing the people who claim that one group is less wrong about their fake deity than another. I see this all the time when religious violence flares up: "they're not following their religion correctly!", coming from people who aren't even in that religion but think they're experts on that religion's teachings (and ignoring the fact that so many believers have incredibly different ideas of what those teachings are). It really annoys me, so I feel the need to call it out. If someone claims that their religion tells them to murder children, then I believe them; it's all made-up anyway, so it's ridiculous for some outsider to say they're doing their religion wrong.