Atheists do not believe in existence of God mainly on the following grounds--- 1. Most of the religions that have faith in God often carry with them mythical stories. These mythological references cannot be accepted by a person of scientific temper. 2. A person born in ambience of Christianity may turn into an atheist because he thinks Jesus Christ cannot be the son of God and his contention that all power is given to him in heaven and in earth by God does not have any rational basis. As the father and son relationship is false, God is not supposed to have given all the things in his hand to Jesus Christ. It is wrong to say that those who have faith in Jesus will have life and those who have no faith in him shall not see life and they will have to face wrath of God. There is no Kingdom of heaven as told by Jesus. The story of allurement by the devil offering Jesus all the kingdom of the world cannot be believed because the devil was never the ruler of the earth. The sermons of Jesus Christ were his own preaching and God had nothing to do with them. There is no existence of the Holy Ghost, angels and heaven. Similarly any particular person cannot be a son of God. Astrology was never regarded as perfect science; most of the astrologers make conjectural statements. They spread falsehood to earn more money. Their unreliable forecast fills suspicion in the mind. This disbelief in contents of the New Testament drives a person to disbelief in existence of God. 3. It is often said by the priests of churches or temples that God favours those who worship Him with great offerings and disfavours those who do not fulfill avaricious or lustful desires of priests or clerics. They also supported divine theory of kingship in which every order of the king was supposed to be a divine order and subjects were forced to bear all atrocities of the king. Tyrannical behaviour of the king and of the clergy forced the masses to revolt. Political, religious and social revolutions weakened not only the authority of kings and clerics but also faith in God. This paved the way for advent of secularism. 4. Religious texts often carrying the revelations or preaching of individuals give different descriptions of creation, different conceptions of God and prescribe different ways of living. Some of the persons, who have studied various religious texts, conclude that all the theories of creation are conjectural. Religions originating from west Asia proclaim that God created Adam out of dust of earth. Then he caused Adam to go into sound sleep and took out his one rib. From this rib of Adam he procreated Eve and gave her to Adam. Adam and Eve were asked not to touch or eat forbidden fruits of a tree or plant. At the instigation of the devil Eve convinced Adam that there was no harm in eating the forbidden fruit. For this crime they were thrown out of heavenly abode and mankind being the progeny of them became the sinner. On the basis of this theory, priests of the churches, clergymen and caretakers of temples or mosques preached that women were cause of degeneration of men. Most of the religions contained slanderous remarks against women. Women were downgraded in religious ceremonies. Women organizations fighting against gender inequality blame religious texts and their interpreters for their predicament. As religious texts speak in the name of God, so God becomes a synonym of terror for them. 5. Propagators of theism often take recourse to miracles to prove existence of God and necessity to take refuge in Him. Now science and technology have reached to such an advanced stage that old stories of miracles appear false and unconvincing to any prudent person 6. Some religious sects cause the people to believe in the theory of Avataravad which tells that whenever righteousness is on the decline, whenever demons and terrorists are on the rise and whenever the virtuous, the noble or saintly persons are exposed to terror God comes on the earth in human or some other form to rescue the oppressed and to establish a reign of righteousness. Any prudent person who has studied history knows that God did not come to the rescue of innocent people who suffered heavily during first world war and second world war nor He is visible anywhere even today when demons in the form of terrorists are killing arbitrarily innocent people. Taking benefits from this theory, petty preachers, petty leaders and hypocrites claim themselves to be avatar of God or any deity. How can any prudent person tolerate this nonsense? 7. Some religious sects such as Buddhism and Jainism directly or indirectly deny the existence of God. The followers of these religions or religious sects become atheists because of their faith in those religions. 8. Growth and development of capitalism have propagated materialistic thought to promote consumerism and expansion of markets. 9. Rising affluence in society has generated charm in sensual enjoyment among youth and they have no time to discuss whether God exists or not. 10. Most of the people worship or remember God for fulfillment of worldly desires such as attainment of wealth and property, conception and child-birth especially the birth of male child, downfall of enemies, getting employment, mitigation of disease, restoration of health, promotion in service, rise in profit of business, escaping from punishment or imprisonment or something else. When their wish or ambition is not fulfilled, they begin to talk like an atheist and their faith in God is grossly shaken.