The origin of wickedness is the cliff upon which theism, just as much as pantheism, is wrecked; for both imply optimism. However, evil and sin, both in their terrible magnitude, cannot be disavowed; indeed, because of the promised punishments for the latter, the former is only further increased. Whence all this, in a world that is either itself a God or the well-intentioned work of a God?

— Arthur Schopenhauer

For a great many skeptics are put to waste. But this is meant in the sense that which they vainly focus their energy on ridiculing a certain tiny denomination of Biblical fundamentalism, a denomination seated just one chair away from unbelief; they, the skeptics, cannot believe because they are the most literal of fundamentalists: of those that which must interpret Scripture only by means of a sort of obsolete and dead script of intellectual incompetence. By all means, this is supposed to happen - Scripture states of itself that all thought and interpretation is folly without the Holy Spirit - but on the other hand, it seems, ironically, that if one thinks that the Bible is, in its true essence, an outdated text, he doesn't know much about the world around him nor those who live in it. Either that, or he doesn't know much about what it says in relation to the world around him nor to those who live in it. It's as though he, too, is dead to the world and it to him. He has no spirit: he can only possibly understand Scripture as deceased rather than the modern world's very living narrative.

— Criss Jami

If heaven really exists: then, technically, living is an activity that believers keep themselves busy with — while they wait for their death.

— Mokokoma Mokhonoana

A few years ago the Deists denied the inspiration of the Bible on account of its cruelty. At the same time they worshiped what they were pleased to call the God of Nature. Now we are convinced that Nature is as cruel as the Bible; so that, if the God of Nature did not write the Bible, this God at least has caused earthquakes and pestilence and famine, and this God has allowed millions of his children to destroy one another. So that now we have arrived at the question -- not as to whether the Bible is inspired and not as to whether Jehovah is the real God, but whether there is a God or not.

— Robert G. Ingersoll

Many people are not conforming with theism, but they are comfortable with spiritualism.

— Debasish Mridha

Gods are fragile things, they may be killed by a whiff of science or a dose of common sense. They thrive on servility and shrink before independence. They feed upon worship as kings do upon flattery. That is why the cry of gods at all times is “Worship us or we perish.” A dethroned monarch may retain some of his human dignity while driving a taxi for a living. But a god without his thunderbolt is a poor object.

— Chapman Cohen

Nothing can penetrate the loneliness of the human heart except the highest intensity of the sort of love the religious teachers have preached.

— Bertrand Russell

Therefore, when a person refuses to come to Christ it is never just because of a lack of evidence or because of intellectual difficulties: at root, he refuses to come because he willingly ignores and rejects the drawing of God's Spirit on his heart. No one in the final analysis fails to become a Christian because of a lack of arguments; he fails to become a Christian because he loves darkness rather than light and wants nothing to do with god.

— William Lane Craig

If there's a god, it knows exactly what it would take to convince me and has refused to provide it. In fact, it has gone to great lengths to hide any evidence of its existence. That doesn't seem like a deity that wants to be worshiped to me.

— David G. McAfee

Most theists are deists most of the time, in practice if not in theory. They practice the absence of God instead of the presence of God.

— Peter Kreeft