Hi Clint,
If I may, I would like to take a crack at it.
"Not by works" as far as scholars have studied shows that Paul is refering to the Mosaic works of the law. Slaughtering sheep, cutting the heads off of doves, and so on.
"You may also want to address the citing of Genesis 15:6 in Paul's argument in Galatians 3:6."
"And he brought him forth abroad, and said, look now toward heaven, and tell the stars, if thou be able to number them: and he said unto him, So shall thy seed be.
And he believed in the Lord; and he counted it to him for righteousness"
"Even as Abraham believed God and it was accounted to him for righteousness"
I'm not sure how you are using these two verses, but it you are trying to use them to claim that only faith is required in a Christians life, I believe you are using them to the exclusion of the rest of scripture, which is in violation to 2 Peter 1:20, where we are told that we cannot interpert scripture privately- or exclusively without considering all the Bible says.
While faith is required for salvation, and is the first step in our restoration to a relationship with God, Jesus Christ is clear through the scriptures of many other important steps a Christian must take through faith. He didn't say, only if you want to, don't worry about it if its too tough, you don't have to pick up your cross.
Faith: St. Luke 17:1-10
He gave us Holy Communion: Matthew 26:17-35, John 6:47-58
He gave us baptism: Romans 6:4, Ephesians 4:5, 1 Pet. 3:21
And scriptures are clear that faith and works are intertwined. A Christian without showing the fruit of the Spirit is no Christian at all.
Matthew 18:23-35
19:16-30
20: 1-16
25:31-46
Romans 5:1-11
6:1-4
8:1-17
1 Corinthians 13:1-3
There are many more verses, but here are a few.