[quote=@The Silver Paladin]
How many Freaking times have I debated with someone that Michael is not a Divine Spirit? 
Besides, I have a loophole: Kirei is a "Priest." Maybe he performed some Ritual to make Michael appear, and bound Michael to the Fake Grail.
[/quote]
Except Kirei is dead in the RP's timeline, or rather, a Heroic Spirit keeping watch.