Looking for a movie involving Satan and a police officer and preist in late 70's to early 80's... strange be-headings in hospital of The Madonna... a cups of blood being filled... Writing on the walls in blood.. really scary, the cop who plays part an older man... balding, big nose.. may be dead now.

Maybe The Exorcist 3?

It is Exorcist 3. The cop was played by Goerge C. Scott and he is dead