Because it’s so easy. And christianity dominates our culture with its ignorance.
When a person says, “Without God, life has no meaning,” what he’s really saying is: “I want to believe that life has meaning, and I can’t imagine how that’s possible without God, so I want to believe that God is real.” While this desire is understandable, it’s neither convincing nor necessary. It’s possible to have a meaningful life without any religious convictions, and relying on religion to provide your life with significance can be psychologically damaging. When you seek validation and meaning from outside sources, you risk being failed by the same institution that previously gave meaning to your life. Moreover, the culture of religion can lead to identical group thinking and loss of objectivity. When actions are informed by beliefs, false beliefs can give rise to dangerous or harmful actions. An uncomfortable truth is always better than a comforting lie.
In order to indoctrinate their followers and secure obedience, religions frequently tear people down, creating an emptiness that must then be filled with Jesus, Allah or any other deity. People are told that they are inherently bad or sinful and that the only way to become good is by giving over control of their lives to faith. As there is no evidence that any of that is true, religion, in effect, is creating an imaginary problem simply so that it can sell an imaginary solution. The learned helplessness created by religion can open the way for charlatans and con artists to take advantage of gullible, vulnerable people. False ideas about the universe, including promises that good people are rewarded and sinful people punished, can set false expectations among believers and strip them of the tools they need to properly cope with the challenging events of their lives in a healthy way. It’s often better to face reality head-on and attempt to cope with it directly rather than comfort oneself with deception. As Bertrand Russell once said, “No satisfaction based upon self-deception is solid, and, however unpleasant the truth may be, it is better to face it once for all, to get used to it, and to proceed to build your life in accordance with it.”