If I said that I'm an atheist in your nation?

[Echellesfi]

You would be treated no differently. Religion has little to no bearing on the populus.

[United Azean Federation]

Nobody would give a rats ass as the majority are atheist/agnostic. If you bash religion though, people will think you're a dickhead.

[Camarder]

You would fit right in. Secular Humanism is the majority religion in Camarder.

[Etrurica]

Most would be confused as to why you felt the need to mention it. Atheism is generally assumed, as religion is rare.

[Berhakonia]

We'd call you a monkey and laugh

[Pacomia]

Religion is illegal. You were probably be looked at suspiciously, because if you felt the need to say it then you might not be.

[Fredon Columbia]

Well, the average Fredonian would be a tad disappointed, but you would still be welcomed.

[St Forsberg]

Although a large part of our population is religious, nobody would care at all.

[Ecradia]

Literally no issue. Atheism is mandated by law.

[Ghozo-Kimaria]

Nothing. Most people in Ghozo-Kimaria are indifferent to religion.

[Mahrenbach]

Nobody would care. Mahrenbach is a largely secular nation with religion being mostly a private or folklore matter.

[Saint Hildan League for Biblical Law]

You would be tried for being a heathen. If convicted, you would be stoned to death by the entire citizenry of the Holy Compound.

[Union of Sovereign States and Republics]

Most wouldn't care, as the USSR is officially a state secular nation, even if the majority are Eastern Orthodox Christians.

[Eurasian Socialist Soviet Republics]

You'd better be an atheist. The UESSR is officially secular but practices state atheism - being atheist is a de facto requirement to membership in the Communist Party (i.e., to be in any position of power). Not only religious believers are harassed, but by opposing atheism you might be seen as an enemy of the government.

[Tristainland]

You might viewed as a fool, closed-minded, or depressing, but there won't be any legal consequences. The majority of Tristanians are spiritual in some way or another with 70% of the population practicing Tristanian folk religion and 27% practicing foreign religions. Spirituality plays a major role in our culture.

[German Demokratische Republik]

Most ordinary East Germans would say "Schön für dich." and continue about their business.

[Shamsiyya]

Most ordinary East Germans would say "Schön für dich." and continue about their business.

Gleiches hier. ^^ Although most Shamsiyyans are quite pious, they have better stuff to do than worrying about other people's belief or the lack thereof.

[Rezmaeristan]

Depends on who you tell. Officially, Rezmaeristan guarantees freedom of religion, but in some more culturally conservative areas they might ask you some questions. Due to the rarity of atheists in Rezmaeristan, if the person you say it to is an atheist, he or she'll probably be pleasantly surprised.

[The Natufian Nation]

People would generally be a bit confused. Religion in The Natufian Nation is most similar to Shintoism, with a strong tradition of ancestor worship/reverence as well as nature spirits. No one would be offended or discriminate against you unless you're a jerk about it. They would mostly just pity you for rejecting your ancestors and cutting yourself off from the spirit world around you.

[Strahcoin]

Allowed and tolerated equally. Freedom of speech and religion are held sacred in the Republic of Strahcoin.

[Agarntrop]

No one would care

[Aikoland]

The vast majority of people wouldn't care. While it is true that we are predominantly Roman Catholic here, 17% of the population reports being 'convinced atheists', which actually makes them the second largest demographic as far as religion or non-religion goes in our nation.

[Abercontin-Jereaux]

Unless you say that to a group of devout Christians, it's okay, but not in social media.

[Ravib]

no one would care

[American Pere Housh]

Nobody would care if your an atheist because we have the freedom of religion though only .05% of my country are atheist.