You can't have freedom of religion without having the option to opt out of religion all together.

Not sure how old that print is but atheists in the US were actually not protected by freedom of religion until Obama changed it.

I think someone was trolling the newspaper to see if they'd actually print this.

Dear Alice,
Kindly read a history book. Then go fuck yourself.

https://www.snopes.com/fact-check/stomp-out-atheists/

Tl;dr: Poe's Law

There is always the Flying Spaghetti Monster. Or Satan worship. Or pink unicorns. The letter did say you could pick any God you wanted.