Which is why american style manuals will always ask you to merge it with the subsequent word, without a hyphen I'd use the two hyphens. Given current usage, i very much doubt blessed is strictly considered religious (whatever that might mean)
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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)