Someone—Gerald Mayo—actually did sue The Great Deceiver. It is documented in a book by Alex Ruskell (A Weekly Guide to Being a Model Law Student).
My lawyer friends can find the case at Mayo v. Satan and His Staff 54 F.R.D. 282 (1971). I guess you have to file multiple suits to be found a vexatious litigant?
See our related story below:
First Gerald Mayo sued Satan and now, an Israeli sued God
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