Which is why american style manuals will always ask you to merge it with the subsequent word, without a hyphen Given current usage, i very much doubt blessed is strictly considered religious (whatever that might mean) A similar word is thankful, which is rarely ever ascribed to any deity in particular in popular usage. Leaving non stranded doesn't work either as it is a bound morpheme, a prefix not a word (in english) I'd use the two hyphens.
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