Ooooooh.
MURDER HIM.
But if it really comes to it? They got a way over him.
How?
Sell the damn mountain to developers. Sell it to the skeeziest low-life developer they can find. They will level that hill in an instant to pave it over and build apartos and mansions. And that god will become a shadow of his former self as a result.
I'm pretty sure it can be done. The bureaucracy involved in real estate tends to move fairly slowly. Even the quickest sales can take a month to be finalized. They may yet have time to reverse the transfer of ownership. And then that God will be in trouble.
(EDIT: Also, they got the Mayor on their side, and one of the eldest citizens of their town pulling the strings. That counts for so much clout in a setting like this that you wouldn't believe it. Remember the anime film Summer Wars and how that grandma was bossing around politicians left and right with lines like "DON'T YOU TALK BACK TO ME, BOY! I CHANGED YOUR DIAPERS!" Yep. That.)