Religion depends on divisiveness. This is because it requires an enemy. It is irrelevant if this is an earthbound enemy or one from some other realm of existence. Some people are considered special, others evil, and often, those considered evil must, as a duty of the specially chosen lot, be destroyed. (1)

Religion wears a facade of the divine. It is sectarian, sexist, and usually racist as well, portraying their god as of a certain race.

Extreme atrocities have been committed in the name of God and religion to an extent that it is useless to try to list them. Crusades and massacres have annihilated multitudes.

To defend religion many believers point to supposed secular idiologies such as communism and Nazism as murderers and oppressors. Few people know that the originators of communism were Jewish, and that the overtly violent movement leaders usually cited (hitler, mussolini, franco)  were Roman Catholic.  Even Stalin was an orthodox Christian. In no way were these movements atheistic in any way. Hitler was supported by the Christian Church, which even proclaimed him an instrument of divine authority. (1)

Christianity was from the beginning intolerant and violent. This is the way the religion was meant to be according to Jesus:

Mt 10:34 … Do not think that I have come to bring peace on earth; For I have come to set man against his father, and a daughter against her mother, and a daughter-in-law against her mother-in-law; and a man’s foes will be those of his own household.

He continued to state: nation will rise up against nation, and kingdom against kingdom. Where ever Christianity has spread this has been the case; division and violence. Far from being the harbinger of peace, as presented by his followers, Jesus has been, instead,  the harbinger of war, bloodshed, and human misery.

Why Non-belief?

-Before the “invention” of Jesus, many myths existed which portrayed individuals with nearly identical stories. When all the elements of the preceding myths are removed from Jesus’ story, there remains nothing and no one. Jesus, it turns out, was merely a composite of about twenty previous persons, put together to form one, and as such, was nobody. (2)

-There are multitudes of gods in mankind’s history. Each culture believing their god is the only god. All of these cultures cannot be correct, and we must assume, that none of them are correct.

Obviously there are many comparisons we can make with contemporary religions: Jews are no less devout than Christians; Christians are no less devout than Muslims; and adherents of these Middle Eastern religions are no more or less devout than adherents of Asian religions, such as Hindus and Buddhists. They are all just as convinced of their religions as the others. It’s common to hear similar arguments from them all for the "truth" and "validity" of their religions. excerpt from:

(http://atheism.about.com/od/argumentsagainstgod/a/TooMany.htm)

(1)Introduction: “The Christ Conspiracy” by Acharya S.

(2) “The Christ Conspiracy”, “The Quest for Jesus Christ” by Acharya S.