Either 1) a lack of belief in god/supernatural being due to lack of evidence (weak evidence=agnosticism), or 2) denial of the existance of god/supernatural being. Despite some definitions listed here, atheism does not in its-self attack a single other religion-it is simply a lack of belief in a god. Some might be Satanist-which is by definition not atheism as it requires unfounded faith in a supernatural being ('Satan'); science, in most accepted definitions by scientists, involves testing and falsifying or corroborating of an idea, not stating "fact", and a claim to a supernatural being/god/God is not testable by purely scientific methods.
I agree with atheism because there is no credible evidence for God-only faith in texts that are open to interpretation.
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