Welcome to Atheist Nexus from one ardent atheist to another (check out My Profile and you will see).
I have been running a busy discussion group here since last September. It is called "Origins: Universe, Life, Earth, religion....etc".
Try visiting and joining in.
There is also an Atheists in Japan group, or something along those lines. I have come to really like Japanese culture, and you can read several of my reviews of Japanese films in the Atheist Cinema group.