From an extremist viewpoint, a lot of Balkan Islam is “too diluted.” IIRC a number of pagan traditions survived in Albanian Islam, at least until the advent of Communism.
I have the idea that if Armenians were to convert to Islam, they would disappear among the Turks, Kurds and Persians. Christianity is what keeps the Armenian identity alive.
I’m pretty sure this is borne out by history. Once upon a time a massive chunk of Anatolia identified as Armenian, and it’s not like the Seljuks killed them all.