If you are an atheist, you are a humanist. Your worldview and philosophy of life is free of supernatural and mystical elements. You believe in determinism (all effects have natural causes), and empiricism (evidence-based truth). If the supernatural cannot exist, no credible evidence for spirits can exist. You reject notions of a theistic god/creator, intelligent design, free will, belief in an immortal soul or afterlife, a supernatural origin or design of the universe, a revealed nature of scripture, and a god-based origin of morality.
When living in a religious community, you may be more tolerant and respectful of members’ beliefs than they are of your nonbelief. Believers may feel uncomfortable, defensive, or threatened by your atheism if they see it as personal criticism. J. Krishnamurti said, ‘The constant assertion of belief is an indication of fear.’ Similarly, your constant assertion of nonbelief may be an indication of your fear. It is for others to provide evidence of the existence of their deities. Don’t waste time and creative energy defending your worldview or expressing anger or militancy—these attitudes only perpetuate an ‘us’ versus ‘them’ polarity. You are open-minded, grounded in reality, and enlightened.
You are secure in your nonbelief.