You're reading way too into this. Someone just decided to have some fun and share it with HN. It isn't really serious, but parody isn't the right description. People aren't taking pride in the measurement system, that's somewhat of a joke. "God bless America" is a common cheer taken from a popular song. The UK has something similar with "God save the queen".
Yeah, maybe. Probably. I'm just not a fan of this kind of stuff shrug.
I also don't like "God save the Queen" by the way, or "God be with us" (short for "If God is with us, who shall be against us?" from Romans) we have on the Dutch Euro coins :-)