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Odds and Ends
From the 700s to the 1200s, Baghdad was an Intellectual Cent
7 11, 12:57am
They definitely did important original research, and I do not endorse the OP's position of "Muslims did not contribute to science".
But, as the OP remarked (and this is the part I wanted to emphasize), for most of the time, that school included a significant amount of Jewish and Christian Scholars. And if you look at what is known of the beliefs of the muslim scholars, most weren't very pious and orthodox. Science and religious orthodoxy don't mix particularly well. Rasis, one of the greatest physicians of all time, had to change cities several times to avoid persecution for his secular views.