My nomination goes to Peter Stormare in Constantine.
A small role but played brilliantly, if the devil exist I bet he looks like him.
The runner ups and honourable mentions goes to;
Gabriel Byrne - End of Days (1999)
Al Pacino - The Devil's Advocate (1997)
Robert De Niro - Angel Heart (1987)
There are plenty more
So who would you go with?
PS Best God ever goes to Alanis Morrisette - Dogma (1999)
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"Cook The Man Some F@cking Eggs!"