Hahaha... It reminds me of my Catholic non-practicing grandmom, who when rarely attending Jehovah's Witnesses, the cult my parents converted to, found their music cheap. She was a classical pianist too, so had been exposed to much better music indeed. And we of course know that many great composers did grandiose church music.
Then interestingly, much later, when listening to political propaganda music, I discovered that various JW "Kingdom Songs" were really adaptations of old socialist and communist propaganda music. So sure, church music is propaganda, especially when it's from an official songbook of the cult.
And if you're against natural human expression and inspiration to produce better music, the problem may be your obsessed tendency to want to control their mind. Not their ability to be creative. Afterall, how can you tell that their inspiration is not driven by the Holy Spirit, if you believe in such things? The rules of a human institution can't dictate what is or isn't either, just like there are many currents in each religion. If there was actual divine guidance, presumably instead of sectarianism there'd be convergence and consilience.