This isn't all too uncommon here in the DR, especially in the DR and in the campo areas based on when I lived in Moca.
This person is actually close to the center of a small city on the north coast of the DR. The same one I live in, but not close enough for me to hear the offensive spew.
I also doubt this is satan worship but more than likely a branch of Christianity that values speaking in tongues and maybe they go a little overboard in their enthusiasm.
99% chance they are Evangelical Christians.
My advice is if you are a Christian you might let them know you are one too and ask them politely to turn the volume down.
What difference does it make what religion the person belongs to who is being tormented by this outrageous behavior?