The naturalism that is taught alongside humanism makes humanity into a cosmic accident with no real value, hence the ease with which we abort children and abandon the elderly. Only the Christian worldview, where God is the measure of all things, can preserve life and liberty. Only those who believe that man is made in God’s image have grounds for attributing any kind of worth to humanity. Remember this as you engage other worldviews.
For further study:
The Bible in a year: