When anyone talks about Islam as a “religion”, it only proves that the speaker does not grasp “Islam 101”.
Normally, people expect a “religion” to be about goodness in some manner. This is, at least outwardly, the case with most world faiths.
Islam, however, manages to be bad more effectively than even Satanism does. Satanism is mostly about self indulgence while usually not being overtly bothersome.
Could there be “badder” faiths? Maybe there are, in darkest Africa or some locale like that, but we typically do not hear about them because the number of followers is so little. Islam has managed to achieve a maximum of badness multiplied by number of adherents.