In truth this day exists primarily to protest the National Day of Prayer.
Which is fine really, the thought of a national day of prayer is not only a monumental waste of time, but antithetical what this country was founded on.
Everyday should be the National Day of Reason. But unfortunely we don't see that.
For this day I'd like to re-post the 1st Amendment of the Constitution.
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.So people can pray or reason anyday all they like. Just as long as there is no pretense of National endorsement.