I will give you one source and do your homework too buddy!
The Austrian psychiatrist Sigmund Freud represented atheist dogma in the psychological field in the 19th century.
Freud put forward a theory of psychology that denied the existence of the soul and attempted to explain man's internal world in terms of sexual impulses.
Freud claimed that to have accounted for the origin of psychological problems. Yet his theory actually encouraged new ones. This teaching, which describes man as a species of animal that lives only to satisfy its selfish desires, actually increased loneliness, fear and depression in people by debasing spiritual values.
Pictures by artists influenced by Freud depicted the dark world of that teaching.
Freud's most important attack was aimed at religion. In his book
The Future of an Illusion, published in 1927, he alleged that religious belief was a kind of mental sickness, and maintained that religious beliefs would disappear as man progressed.
But what happened to Freud? He was too depressed to acknowledge that his great students like Carl Jung, Alfred Adler left him for good. Freud suffered psychological problems and resorted to cigar addiction until he died of cancer caused by excessive smoking.
What happened to "GOD is just an invention of the unconscious? " It was totally refuted by the great psychiatrist Carl Jung in his Collective Unconscious which states that
Our ancestors worshiped and acknowledged in the divine as part of Humanity's evolving Psyche! 
The Collapse Of Atheism.com
Sigmund Freud - Wikipedia, the free encyclopedia
BTW better read his works for his complete biography!
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