The New Testament teaching that most of humanity will be among the lost, Mt 7:13-14, should be a teaching that gives Christians a lot of concern. But not for the reasons you might think. Currently the world population is about 68.5% non-Christian and few of these billions will ever become Christians. Obviously, Christian efforts to evangelize these billions of people are not getting the job done. Logically, this puts Christians in an an absurdly ridiculous position. From the Errancy Discussion list, 4-29-97:
Such a Lord, who murders innocent babies, is not good. God is not good. Of course, the story is a myth, it never really happened. That is besides the point. God, as described in the Bible, makes Hitler look saintly. Unfortunately, Hitler was real, but, thank God, God isn't. Still, how can you Christians worship a God who murders babies? Don't you people have any morals? Its bad enough you believe in God; what's worse, you are blind to his evil nature. You people worship an imaginary baby-killer.
If this life were all of existance, you might have a point; however Christians believe that we are primarily "spiritual" creatures made in the image of God (Gen. 1:26). This life is not all that matters. How cruel it would have been to preserve all of those babies of hard-hearted idolaters to mature and become like their parents only to lose their souls in eternity; but a loving and merciful God now has in his care the souls of those innocent children.
According to this logic, God should see that the children and babies of all sinful people are killed before "the age of accountability" so that this loving and merciful God could have in his care the souls of "these innocent children"? What made the Amalekite children so special that God wanted to "preserve" them any more than the children of other idolatrous people? We know from archaeological discoveries that Aztecs and Incas were idolatrous nations, who even sacrificed children to their gods. Why didn't Yahweh "preserve" their children so that they wouldn't have grown up to be like their "hard-hearted" idolatrous parents?
This "explanation" of the many Yahwistic massacres recorded in the OT is simply a last-ditch effort to explain a problem that is completely incompatible with both the biblical inerrancy doctrine and the claim that God is loving and merciful. If for some reason the Amalekites, Midianites, Canaanites, etc., had to be ethnically exterminated, there was no reason at all to massacre the children and infants too. Why couldn't they have been brought back as captives, adopted into Hebrew families, and reared in the way that Hebrew children were? That way, they would not have grown up to be "hard-hearted" idolaters, any more than the Israelites themselves were at times hard-hearted idolaters (but that's another story). I'd like to hear Paul's "explanation" of this.