Atheism is a mental disorder ( St. Nektarios )

Atheism is a mental disorder: it is a terrible ailment of the soul that is difficult to cure. Atheism is a passion that severely oppresses whomever it seizes.
It holds in store many misfortunes for its captive, and becomes harmful not only for him but also
for others who come into contact with him.
 

Atheism denies the existence of God. It denies that there is a divine Creator of the universe. It denies
God’s providence, His wisdom, His goodness, and,
in general, His divine qualities. Atheism teaches a falsehood to its followers and contrives false
theories concerning the creation of the universe. It professes, as Pythia upon a tripod,1 that the creation is an outcome of chance, that it is perpetuated and preserved through purposeless,
random interactions, that its splendor transpired spontaneously over time, and that the harmony, grace, and beauty witnessed in nature are inherent
attributes of natural laws. Atheism detracts from God, Whom it has denied, His divine characteristics
, and, instead, bestows them and His creative power
to lifeless and feeble matter.
 

Atheism freely proclaims matter to be the cause of all things, and it deifies matter in order to deny the existence of a superior Being, of a supreme, creative Spirit Who cares for and sustains all things.
On account of disbelief, matter becomes the only true entity; whereas the spirit becomes non-existent. 


For atheism, the spirit and the soul are egotistical inventions of man, concocted to satisfy his vainglory. Atheism denies man’s spiritual nature. It
drags man down from the lofty height where he has been placed by the Creator’s power and grace, and lowers him amongst the rank of irrational animals,
which he accepts as ancestors of his distinguished and noblelineage. Atheism does all this in order to bear witness to the words of the Psalm:
“Man, being in honor, did not understand; he is
compared to the mindless animals, and is become like unto them” (Ps. 48:20).
 

Atheism detracts faith, hope, and love from the
world, these life-giving sources of true happiness for man, it expels God’s righteousness from the world, and denies the existence of God’s providence and succor.
 

Atheism accepts the laws that exist in nature, yet denies Him Who has appointed these laws. Atheism
seeksto lead man to an imaginary happiness;
however, it abandons and deserts him in the middle of nowhere, in the valley of lamentation, barren of all heavenly goods, void of consolation from above,
empty of spiritual strength, bereft of the power of moral virtue, and stripped of the only indispensable
provisions upon the earth: faith, hope, and love.
 

Atheism condemns poor man to perdition and leaves him standing alone as prey amidst life’s difficulties. Having removed love from within man, atheism subsequently  deprives him of the love from others, and it isolates him from family, relatives, and friends.
 

Atheism displaces any hope of a better future and
replaces it with despair.
Atheism is awful! It is the worst of all spiritual illnesses!
This tripod was a bronze altar at Delphi, in ancient Greece, upon which the priestess of Apollo named
Pythia sat to utter oracles. 

St. Nektarios

The Foolishness of Atheism ( St. Nikolai Velimirovich )

"The fool hath said in his heart, 'There is no God'. They are corrupt. They have done abominable works" (Psalm 14:1).

The mind is the rudder of man's entire being. It counsels, persuades and guides. Both the soul and the body act according to the mind. If the mind is upright before God, then the whole man is upright. If the mind is iniquitous before God, the whole man is iniquitous. Even if someone merely thinks, "There is no God," the thought immediately manifests itself in his deeds. Evil thoughts come first and evil deeds inevitably follow.

Do you see how well the inspired prophet knows the nature of man? First, he underlines the cause, then he cites the consequences. Evil deeds necessarily proceed from evil thoughts. That is why, brethren, you should not believe those who say: "I do not believe in God, but I do good deeds." First of all, he who does not believe in God does not know what good is, nor can he differentiate good from evil. By his disbelief, a man cuts himself off from the greatest Good and the Source of every good!

Furthermore, let us carefully study this: you will see that all the deeds of the ungodly are corrupt and hateful. They are corrupt because they are evil, worthless and transitory; they are hateful, because they are contrary to the will of the Living God. The godless cannot distinguish good from evil, for only in the light of God's law can one determine precisely what is good and what is evil.

However, it can also be that those who merely say they believe in God do corrupt and hateful deeds, acknowledging God with their lips but denying Him in deeds. It is good to confess God with your lips, but that is a long way from being enough! One must also acknowledge Him with the heart, and confirm one's faith by good deeds. Even so, it does happen that a man believes in his heart, and confesses with his lips, and still sins. This happens either from the weakness of the will or from the devil's arrows. Let such a one repent, and he will be forgiven immediately.

Repentance is salvific even for the godless; how much more so for a believer? As long as a man is on earth, he has a chance for repentance. But who can be certain that his time will extend beyond this night? Hence, delaying repentance is utter foolishness.
St. Nikolai Velimirovich