Sword of God Decapitation...

Seriously, there really isn't one for Godlike characters/NPCs. BH is supposed to be able to handle epic style stuff, but it's not out. I'd just take an arbitrary number, like 500 points and split 'em up in the categories. Might handle Minor Godlings. 1000 perhaps for Lesser Gods. 5000 split up could do your greater Gods and maybe 10000 split up could work for your Old Gods. Pretty much your greater Supernats from Armageddon are made with only around 200 points.

No clue about drawbacks though. How many does a God really have?

ALL YOUR ZOMBIE ARE BELONG TO US!
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Don't go away mad...

Life's one big joke. So laugh often, laugh hard, don't get pissy over the little things. Cause the punchline's not really worth worrying over.