I've always wondered.
Example:
My friend: The Phillies finally scored a run.
Me: Thank God!
English
#Offtopic
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The only time it would slightly irk me is if someone was taking the credit out of mortal hands, say for someone's hard work resulting in an extraordinary outcome. If someone says "goddidit" I'd be a little irate I guess. Fortunately it doesn't happen in this country much