While not wanting to deny the difficulty of the passage, I do say that the entire cycle of stories with Abraham is about covenant. Early on, God chose Abraham. The question is, will Abraham choose God? And that is the elemental question facing each of us. Every day we are beset with perplexing questions: Why do natural disasters kill so many? Why are hatred and terrorism such dire threats in our world? Why are economic forces beyond our control forcing us to cut back, go without, or cause others to lose jobs and go hungry?
God has chosen us and the question is will we with all our heart and being choose God? We will live our lives in trust to the one true and almighty God who created all, sustains all, and offers us true life.