Prince of Darkness (1987) IMDb
Fairly decent Lovecraft sacrilege. Bad acting, it takes amazingly long for the unharmed people to get a clue, and then Satan turns out to be very close to the popular idea despite the neat piece of deconstruction the script purports to be performing. If the story had actually worked according to the premises of the dialogue, it could have been extraordinary, but it’s all just shallow quantum woo.
References here: Noein: To Your Other Self (2005).