Abram's Sacrifice

How do we see Abram's thoughts were on the promises of God? Why did Abram ask God for some assurance of His promise? Why did God point Abram to the sacrifices? How are the different types of sacrifices types of Christ? Why did Abram sit before the sacrifice? Why does the LORD have to approve the sacrifice? Why is it vital to see that a sinner can not look to himself for assurance but only to the Sacrifice of Christ alone? How did God teach Abram that it was only in His Way that the promise would be fulfilled? Why does Scripture tell us so many times to wait on the LORD and how is it meant for hope not discouragement? What do the birds that Abram drove away signify? Are you happy with what you know about Christ's Sacrifice? What was the purpose of the LORD in causing Abram to enter into a 'deep sleep'.