This is, as you can imagine, a large topic. Probably a good start is to study the sayings of Epicurus - the Greek philosopher; here are a few:
Why should I fear death? If I am, death is not. If death is, I am not. Why should I fear that which cannot exist when I do?
-- Epicurus, quoted by Robert Green Ingersoll in "Why I Am an Agnostic"
If the gods listened to the prayers of men, all humankind would quickly perish since they constantly pray for many evils to befall one another.
-- Epicurus, quoted from Eugene O'Connor, The Essential Epicurus
Either God wants to abolish evil, and cannot; Or he can, but does not want to; Or he cannot and does not want to. If he wants to, but cannot, he is impotent. If he can, but does not want to, he is wicked. But, if God both can and wants to abolish evil, then how come evil is in the world?
-- Epicurus (attributed: source unknown)
Atheism does not search for philosophical justification as it is based on the rejection of pre-assumptions or beliefs in favor of facts. Philosophy is based upon the most basic beliefs, concepts, and attitudes of an individual or group, and therefore not on facts.
It is simple. There is absolutely no proof that supernatural entities control human destiny, human actions or nature. Therefore, there is no rational reason to give religious belief any time, credence, or authority whatsoever. It is much better to concentrate your time and energy in improving your own life, taking responsibility for yourself and controlling your own destiny.
Janine Stiles has written: 'Framework for analysing cooperative/competitive perspectives in strategic partnerships' 'A philosophical justification for a realist approach to strategic alliance research'
The practical justification was purely that they thought they could go it alone on the strength of their cotton exports, and that they could defeat any military intervention. The philosophical justification was that they were a noble and heroic society, with blood-links to the Cavaliers of the English Civil War, different and superior to the industrial North. If their cotton trade depended on slavery, then slavery could be seen as a God-given arrangement of man and master.
Atheism is a noun.
Atheism is the belief that there is no god.
There are no prophets of atheism.
George H. Smith has written: 'Atheism, Ayn Rand, and other heresies' -- subject(s): Atheism, Philosophy, Religion and state 'The Wealth of Nations Part 1' 'Why Atheism?' -- subject(s): atheism 'Atheism' -- subject(s): atheism, Atheism, Controversial literature, Christianity
Atheism is not a religion. [S] [V] [o] Here you are, a complete sentence with atheism.
"Atheism is not a religion."
Atheism is the lack of belief in God.
Atheism is by definition not a religion.