When we ask if capitalism is a moral system, then we are actually asking if a capitalistic system creates an environment where people act in morally responsible ways. In a sense, we are inquiring as to the morality of its adherents, more than the system itself.
Christians recognize that humanity is controlled by the bridal of her affections. Before the would-be economist considers incentives and marginal utility he must first understand that God has created the cornerstone of economics—the affections. Christians naturally think in economic categories because we naturally think in terms of the affections. Equipped with this foundational principle of economics, we can begin to comprehend its simple and pervasive nature.