Wouldn't you say that spirituality opens a strong possibility for God? I just find physicalism more compatible with Atheism.
Well, that's an interesting question with a lot of complex answers!
The answer is both yes, and no. If someone who had left the religion of their childhood with all its beliefs, choosing instead an atheistic view that rejects say, the anthropomorphic images of a God that sounds like some "guy in the sky" sort of thing, that when they experience something that they historically associated with "God", that it can cause a certain conflict, like feeling like a hypocrite, "I say I don't believe God exists, yet, I feel this profound connection to life that moves me beyond words." The heart says 'this is real', and the head say, but Noah's Ark is a myth!
Ultimately for that person they can try to deny these feelings, to dismiss them as a weak holdover from religion, or they can take a deep look at these very human experiences and come to understand that religion does NOT own this stuff! Spiritual experiences are common in all cultures, whether religious or not. They can try to evolve their understanding of what "God" is outside the context of a theology laden religious lockbox. They don't go back to imagining magical stories are literal scientific facts, but rather move into a far more poetic or metaphoric appreciation of religious symbolism like that, understanding human spirituality first, symbolism second.
Now for other's who never made that association between belief in God with human spiritual experience, they simply just don't make that connection and it's no problem for them.
Here's a great quote I think captures well what a spiritual person who is also non-believer in the theistic deity might express this:
“The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. He to whom the emotion is a stranger, who can no longer pause to wonder and stand wrapped in awe, is as good as dead —his eyes are closed. The insight into the mystery of life, coupled though it be with fear, has also given rise to religion. To know what is impenetrable to us really exists, manifesting itself as the highest wisdom and the most radiant beauty, which our dull faculties can comprehend only in their most primitive forms—this knowledge, this feeling is at the center of true religiousness.”
- Albert Einstein, Living Philosophies
That is spirituality, right there. This goes beyond some flat reductionist, materialistic understanding into embracing the Mystery. It touches us beyond the mind into the unfathomable depths of our very own being.