As Copan explains, utilitarianism "is a consequence-based ethic that looks at what will bring the “greatest happiness” to the most people. Whatever brings happiness is “good”; and, the more happiness, the better it is. In this ethical view, the outcome or consequences are more important than the means of getting there."
This article will equip the follower of Christ to intelligently respond to this type of ethical theory.
You can check it out here.
Courage and Godspeed,