My biggest problem with Christianity is that it devalues humans and forces you to accept that devaluation. It teaches you that your whole nature is to be bad and any good you have done is the result of god. Not only that, but you must beg forgiveness for your bad nature from the very god that gave it to you.
It is human nature to do evil, but it is also human nature to do good.
It is human nature to do evil, but it is also human nature to do good.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell