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Nice try Khandro but I'm sure you were aware that isn’t comparable. :-)
The main issue is with your first use of the word “nothing”.
“Nothing is better than eternal happiness”, does not mean that is it better to have nothing than eternal happiness. It is stating instead that there is nothing one could suggest that is better.
But in the second statement that is exactly how the word “nothing is being used. That there is a state of nothing that is not as good as the state of having something, such as a ham sandwich.
By combining the two as if they mean the same you get a non-sensible result.
However, if we, for the sake of discussion take it as correct that blasphemy is bad manners (and of course we need not agree it really is).
And that the claim being made is that blasphemy should be punished by death. Then there is no word with a changed meaning. It means blasphemy (or bad manners) each time. Accepted that there are other forms of bad manners.
It therefore follows, “sure as eggs” that, that particular form of bad manners is being advocated as deserving of the death punishment (even if other forms are not).