I posted all my final replies to Chapter 3 here: http://olivianus.thekingsparlor.com/apologetics-vs-atheism/the-end-of-christianity-ed-loftus-reply-to-chapter-3-part-3-final-reply
I guess we'll go through the major items one at a time.
Loftus asks, “Why did a completely fulfilled, triune supreme being, who neither needed nor wanted anything, bother creating at all? Why would he do it knowing this world would have so much ubiquitous suffering in it and knowing he would inexplicably have to suffer an atoning death for us? He knew billions of people would suffer eternally for his decision.” (90-91)
I. Why did God create?
The Covenant of Redemption is behind this but I will explain that in subsequent points immediately after this one. The answer to this question is the primary concern of Paul in Ephesians chapter 3. God’s decree from the beginning was a productive decree in which He would glorify Himself. To the Son, “a bride adorned for her husband,” Rev 21:2, a body in which he is the head ( Col 1:18, 1 Corinthians 12), and a kingdom of many brethren which will have no end (Rom 8:28-29, Dan 7:14); To the Spirit, “as living stones, are being built up as a spiritual house,” 1 Peter 2:5, and “having been built on the foundation of the apostles and prophets, Christ Jesus Himself being the corner stone, in whom the whole building, being fitted together, is growing into a holy temple in the Lord, in whom you also are being built together into a dwelling of God in the Spirit,” Ephesians 2:20-22; To the Father, the eternal purpose of Christ is made manifest when He brings to light, “what is the administration of the mystery which for ages has been hidden in God who created all things; so that the manifold wisdom of God might now be made known through the church to the rulers and the authorities in the heavenly places,” Ephesians 3:9-11; and after the Son delivers up this kingdom to the Father, He will be all in all ( 1 Corinthians 15:24-28). So why did God create? It is an expression of love between the persons of the Trinity and the full wisdom of God the Father is seen and glorified through it.Samuel Rutherford said,
“In God’s way of nature, he can make dispensations to himself, so in the ways of grace, we cannot find him out. However, sure of crabbed and knotty timber, he makes nerw buildings; and it is very base and untoward clay, that Christ, who maketh all things new, cannot frame a vessel of mercy of. To change one specie or kind of a creature into another, a lion into a lamb, and to cause the wolf and the lamb dwell together, and the leopard lie down with the kid, and the calf and the young lion and the fatling together, and a little child to lead them, is the proper work of omnipotency, whatever be the preparations, or indisposition of sinners.” Christ Dying and Drawing Sinners to Himself, pg. 281. The general idea is that our sinfulness provides an opportunity for God to glorify himself and display his glory in a way that could not happen without a fallen creation. This is depicted in the sinful woman’s contrition in Luke 7:49. http://www.biblegateway.com/passage/?search=Luke+7&version=NASB