His argument was that it was unfair that atheists had no such recognized days.
The case was brought before a judge. After listening to the passionate presentation by the lawyer, the judge banged his gavel declaring, "Case Dismissed!"
The lawyer immediately stood, objecting to the ruling saying, "Your honour, how can you possibly dismiss this case? The Christians have Christmas, Easter and others. The Jews have Passover, Yom Kippur and Hanukkah, yet my client and all other atheists have no such holidays."
The judge leaned forward in his chair saying, "But you do. Your client, Counsel, is woefully ignorant."
The lawyer said, "Your Honor, we are unaware of any special observance or holiday for atheists..."
The judge replied, "The calendar says April 1st is April Fools' Day. Psalm 14:1 states, 'The fool says in his heart, there is no God.' It is the opinion of this court that, if your client says there is no God, then he is a fool. Therefore, April 1st is his day. Court is adjourned."