God isn't the definition of spirituality. It is just as spiritual to take LSD and mescaline and chant around a fire. Thus, feelings of spirituality are programmed into the human biochemistry. Read DMT: The Spirit Molecule.

You're fooling yourself into believing your nothing more than a naturally haywire complex nerve formation fueled by drugs and bio-electricity. Evolution will slowly replace humans who are exceptionally spiritual by means of suicide and war; those who are too selfish to accept their 'god' is no bigger invention than someone elses.