National Atheists Day

Although I had read online about the joke that 1 April is “National Atheists Day,” it was not until yesterday that I saw a bumpersticker with this message on a vehicle while driving around town. At the top it had the name of the day, then “April 1st” in large lettering, and then “Psalm 13:1 — The fool hath said in his heart: There is no God.” I fully support the constitutional right of citizens to express their opinions, including views directly antagonistic to mine. I wish to point out, however, that this message is the paragon of “preaching to the choir” as it says nothing more than, “We are smart. They are stupid.” Deprecation of the intelligence of unbelievers is a completely ineffective method of evangelization.

Purely linguistic considerations

• Why is the day national instead of international or even universal?
• Why is atheists plural? It's grammatically incorrect to use a plural in a compound noun.
• Why isn't it Atheism Day? I know of no actual observance that uses the term for the person rather than the idea.