Father Orsino knows spirits. Christos is a master of them. Together, they can force this creature into its true form - not the smiling man, but the bloated leech underneath it, cutting it off from its debtors. Or possibly using them all up to fuel the transformation. Either way, it'll be tougher and more powerful like that, but it'll change this from a social fight into a physical one.
We've got a couple of Prime/Spirit mages here. Orsino has Prime 4 and the flows are sending power to al-Saud here.
He reveals the archangel possessing him to his flock-and they realize that God's calling is for them to become martyrs, changing the Resonance of the Prime Energy they're supplying from something like Pleading/Begging/Survivor to Martyr/Holy/etc- something that al-Saud can't use to sustain his life. As a spirit stuck in a certain paradigm where everything has value, and forced to confront Quintessence which is literally beyond valuation-he might not be able to use it, period.
If people can figure out how Serafina and Christos can help, that's 2 extra autosuccesses.