Introduction

Is a Proof of the Non-Existence of a God Even Possible? by Jeffery Jay Lowder
A common objection to atheism -- one stated by many scholars and laymen, theists and nontheists -- is that it is impossible to prove the non-existence of God. Yet there are actually two ways to prove the non-existence of something. One way is to prove that it cannot exist because its very concept is self-contradictory (e.g., square circles, married bachelors, etc.). The other way is by carefully looking and seeing. Both of these methods can and have been used to disprove various conceptions of God.

Arguments for Atheism from The Freethought Zone
Presents several arguments for atheism.

Argument from Evil

The Problem of Evil by Dennis McCallum
A Christian presents the free-will defense to the argument from evil. (Our rebuttal to this argument is here.)

Does the Free-Will Defense Constitute a Sound Theodicy? by Dr. Niclas Berggren
Reconciling an all-knowing, all-powerful, and perfectly good god with the existence of evil is known as the theodicy problem. Theists usually argue that human free-will excuses God of the blame for evil. In this essay, Berggren argues that the free-will defense fails.

The Problem of Natural Evil by Brian Marston
"Although an omniscient, omnipotent, perfectly good God could be justified in allowing moral evil, such a God is never justified in creating a world in which natural evil occurs. Moral evil is both necessary and sufficient to produce moral characters and spur men to right action. Natural evil confers no additional benefits that moral evil cannot accomplish to the same degree and extent, and in fact natural evil is not even adequate to foster interpersonal moral virtues, such as forgiveness and tolerance. A benevolent God would allow no more evil than is absolutely necessary to achieve his ends. Because natural evil is gratuitous, its existence is incompatible with the existence of God."

The Evidential Argument from Evil by Nicholas Tattersall
Tattersall explains the evidential argument from evil, refuting various theistic defenses to it.

Argument from Physical Minds

The Empirical Case for Metaphysical Naturalism by Jeffery Jay Lowder
Lowder argues that the physical dependence of minds upon the brain, along with the argument from evil, can be used to construct an empirical case for metaphysical naturalism.

The Case Against Immortality by Keith Augustine
Augustine presents both the philosophical and scientific cases against immortality.

Dr. Tooley's Opening Statement by Michael Tooley
Tooley claims that "All minds that it is generally agreed that we are definitely acquainted with ... are either purely physical in nature or else are causally dependent on something physical in nature." Therefore, Tooley concludes, "probably there is no mind that exists independently of some associated physical arrangement of matter that it is either identical with or at least causally dependent upon."

Argument from Nonbelief

The Arguments from Evil and Nonbelief by Theodore Drange
"When God is conceived of as an all-powerful and all-loving deity, many arguments for his nonexistence can be raised. Two of the main ones are the Argument from Evil (hereafter abbreviated AE) and the Argument from Nonbelief (hereafter abbreviated ANB). In what follows, I shall provide precise formulations of those two arguments, make some comments about them, and then try to refute the main defenses (of God's existence) that might be put forward against ANB, which I consider the stronger of the two. I take ANB to be a sound argument establishing the proposition that God (conceived of in a certain way) does not exist."

Nonbelief vs. Lack of Evidence by Theodore Drange
Here are two atheological arguments, called the "Lack-of-evidence Argument" (LEA) and "the Argument from Nonbelief" (ANB). LEA: Probably, if God were to exist then there would be good objective evidence for that. But there is no good objective evidence for God's existence. Therefore, probably God does not exist. ANB: Probably, if God were to exist then there would not be many nonbelievers in the world. But there are many nonbelievers in the world. Therefore, probably God does not exist. Reasons are given for saying that although LEA is not totally implausible, ANB is a stronger atheological argument than it is.

Argument from the Complexity of God

The Improbability of God by Richard Dawkins
"Even if the physicist needs to postulate an irreducible minimum that had to be present in the beginning, in order for the universe to get started, that irreducible minimum is certainly extremely simple. By definition, explanations that build on simple premises are more plausible and more satisfying than explanations that have to postulate complex and statistically improbable beginnings. And you can't get much more complex than an Almighty God!"

Science, Complexity, and God from The Freethought Zone
Uses the tools of the Argument from Design (as propounded by Behe and other "Intelligent Design" advocates) to argue that, on the grounds of complexity, God does not exist.

Miscelaneous Arguments

On the Nature of Morality by Dr. Niclas Berggren
Argues against the existence of objective moral values. Along the way, he states an interesting "Moral Knowledge Argument for Atheism".

God and Moral Autonomy by James Rachels
"In what follows I will present an argument against the existence of God that is based on the conception of God as a fitting object of worship. The argument is that God cannot exist, because there could not be a being toward whom we should adopt such an attitude."

The Errancy of Fundamentalism Disproves the God of the Bible by Dr. Niclas Berggren
Shows that the Christian god does not exist, since if he did, he would not have produced a revelation like the Bible, which contains errors and ambiguities.

Incompatible-Properties Arguments: A Survey by Theodore Drange
Ten atheological arguments are presented (and briefly discussed) in each of which there is an apparently incompatible pair of divine attributes.

Why the Christian God is Impossible by Chad Docterman
"I have offered arguments for the impossibility, and thus the non- existence, of the Christian God Yahweh. No reasonable and free thinking individual can accept the existence of a being whose nature is as contradictory as that of Yahweh, the "perfect" creator of our imperfect universe. The existence of Yahweh is as impossible as the existence of cubic spheres or invisible pink unicorns."