Not even close to being close.

[en.wikipedia.org]

Well, I'm Portuguese and I live in Dublin, Ireland. Hopefully it'll make me one of a kind here... Lol!!! I don't give a rat's a**e where most come from, I'm more worried about having people with good attitude.

Advertises and starting point is in US, so most of members are from there, we should start creating local groups for outside US regions.

I’m English, and here there is widespread apathy towards religion. Church attendances are decreasing year on year, with congregations generally being much older. A large percentage of the population are athiest, agnostic, sceptic etc.

Young site, available internet, dominant languages, American culture relevance, and marketing all contribute to why you'd have more US atheists than other countries.

[en.wikipedia.org]

Can't vouch for how accurate or up to date this is but it may give you links to stuff that may help

[atheistscholar.org]

I really don’t think so , I believe it all depends on how people are raised