[Mengerian]

Church bells are not spoken words. They are merely a string of tones using seven notes, and sharps or flats thereof. Prayer calls are spoken / or "chanted" as the case may be.

Islamic prayer calls (through a PA system of amplified loudspeakers) are screaching out spoken words, words proclaiming "Allah as the only one" "Islam is the light"; etc. De-facto promotion of Islam throughout audible city-wide prayer calls via loudspeakers is not the same as church bells.

[GL of Sector 2814]

While not identical, it’s certainly arguable that the two (bells & calls) are comparable expressions of religion; thus the ruling.