The Tzitz Eliezer (14:91), who quotes the Ran in Sanhedrin (61b) who says that the worship conducted by Muslims can be characterized as avodah zarah, is NOT a daas yochid. See also the Ritva in Pesachim (25b sv mah rotzeach) who says that while Muslims are not ovdei avodah zarah, Islam is considered avodah zarah for Jews. The Radbaz writes similarly in a responsum (4:1163).
The Rambam said that Islam is not avodah zarah and its adherents are not ovdei avodah zarah. But that pertains to non-Jews, not Jews.