God in Islam

In Islam, God is seen as the creator and sustainer of the universe, who lives eternally and will eventually resurrect all humans. God is conceived as a perfect, singular, immortal, omnipotent, and omniscient god, completely infinite in all of his attributes. Islam further emphasizes that God is most-merciful. According to Islamic theology, God has no physical body or gender, although he is always referred to with masculine grammatical articles, and there is nothing else like him in any way whatsoever. Wikipedia

God in Judaism

In Judaism, God has been conceived in a variety of ways. Traditionally, Judaism holds that Yahweh, the god of Abraham, Isaac, and Jacob and the national god of the Israelites, delivered the Israelites from slavery in Egypt, and gave them the Law of Moses at Mount Sinai as described in the Torah. Wikipedia

God in Christianity

Concept of deity in the Christian religion

In Christianity, God is believed to be the eternal, supreme being who created and preserves all things. Christians believe in a monotheistic conception of God, which is both transcendent and immanent. Wikipedia

Atheism as rejection of religious beliefs

A central, common core of Judaism, Christianity, and Islam is the affirmation of the reality of one, and only one, God. Adherents of these faiths believe that there is a God who created the universe out of nothing and who has absolute sovereignty over all his creation; this includes, of course, human beings—who are not only utterly dependent on this creative power but also sinful and who, or so the faithful must believe, can only make adequate sense of their lives by accepting, without question, God’s ordinances for them. The varieties of atheism are numerous, but all atheists reject such a set of beliefs.

Atheism, however, casts a wider net and rejects all belief in “spiritual beings,” and to the extent that belief in spiritual beings is definitive of what it means for a system to be religious, atheism rejects religion. So atheism is not only a rejection of the central conceptions of Judaism, Christianity, and Islam; it is, as well, a rejection of the religious beliefs of such African religions as that of the Dinka and the Nuer, of the anthropomorphic gods of classical Greece and Rome, and of the transcendental conceptions of Hinduism and Buddhism. Generally atheism is a denial of God or of the gods, and if religion is defined in terms of belief in spiritual beings, then atheism is the rejection of all religious belief.

https://www.britannica.com/topic/atheism