Am I Really an Atheist?

I've been rethinking the notion of calling myself an atheist. While it is true that I no longer believe in the primitive religious notion of God i.e. a willful conscious being outside nature; perhaps the real great philosophers and thinkers didn't use the term God in that way. Perhaps the ancient thinkers meant by God as the Ultimate Existence, or Being. Spinoza explicitly stated this, and perhaps others, such as Maimonides also meant this. I'd rather think of my self in the tradition of the great spiritual and philosophical thinkers rather than the materialist atheists. Of course, in the end, how we define ourselves doesn't really matter that much. What matters more is what we think, feel, and believe.