A major problem with Christianity is the fact it distorts mortality for its believers. With salvation based religion, believers no longer have to put work or act moral to receive an infinite reward.
They no longer have to value human interactions the same.
Under religion the acts of man are no longer great, as it was God's will after all. When it is inescapable that an act of man that caused a miracle-like happening, the religious will often point out that it was “God's will” that made it happen. This Religious selfishness creates a system, in which the believer does not correctly value humanity, as an imaginary being is given most praise. This bastardizes society and allows religion to poison the well and gain power and will ultimately repress the achievements of man.