It is nice when you can find some who speaks so clearly on a topic.  I recommend you read the entire article by Greta Christina, but these are her concluding words.  Her post is a response to William Lane Craig an educated religious apologist who in his writing and debates defends the christian religion against rationality and reality.

“It’s funny. One of the most common pieces of bigotry aimed at atheism is that it doesn’t provide any basis for morality. It’s widely assumed that without religion — without moral teachings from religious traditions, and without fear of eternal punishment and desire for eternal reward — people would behave entirely selfishly, with no concern for others. And atheists are commonly accused of moral relativism: of thinking that there are no fundamental moral principles, and that all morality can be adapted to suit the needs of the moment.

But it isn’t atheists who are saying, “Well, sure, genocide seems wrong… but under some circumstances, it actually makes a certain amount of sense.” It isn’t atheists who are saying, “Well, sure, infanticide seems wrong… but looked at in a certain light, it really isn’t all that bad.” It isn’t atheists who are prioritizing an attachment to an ancient ideology over the clearest moral principles one can imagine: the principle that entire races ought not to be systematically exterminated, and the principle that children ought not to be slaughtered.

Human beings have intrinsic compassion. We have a sense of justice. We have feelings of revulsion and rage when we see others harmed. We have a desire to help create a livable world. We have a willingness to make personal sacrifices — sometimes great sacrifices — to help others in need. And contrary to what Craig and many other Christians think, these moral emotions don’t derive from the Bible, and don’t require belief in God. They’re taught by virtually every religion and every society, and atheists feel them every bit as much as believers. Humans are a social species, and these emotions and principles evolved because they help members of a social species survive and reproduce. (Other social species seem to have some or all of these moral emotions as well.)

But our compassion and justice, our altruism and moral revulsion, can be twisted. They can be stunted. They can be denied, ignored, shoved to the back burner, rationalized away. They can be contorted to the point where we’re saying that black is white, war is peace, and the most blatant evil is actually goodness if you squint your eyes just right. They can be contorted to the point where we’re saying that genocide is okay because everyone gets what they deserve in the afterlife, and that infanticide is morally necessary to teach a lesson about the evils of murdering children.

And religion is Exhibit A in how this can happen.”