Atheism is one version of nihilism unless some attempt is made to redefine the basic concepts. It sounds like you already have and it sounds very similar to what I embrace. I don't know where that leaves us, but it doesn't worry me either. I'm not trying to convert anyone. But I'm also very satisfied by my working model for God. You may choose a less-loaded term to describe where you derive a "life rich with meaning and spiritual satisfaction".