God Created Adam Sin-ful
Pretty bold statement. But before summarily discarding what I said I want to inform you that I have not read or studied this question from other resources. This is entirely my conclusions after looking at the Scripture and reasoning this out on my own (Isa. 1:18 ).
First, I agree that there is only One God, that there is none like Him, and He gives His glory to no one (1 Sam. 2:2). I also agree that God Himself is the standard by which everything and everyone is judged "against." I believe that there are no degrees of holiness, or righteousness, and even sin. One either has the Holy Spirit or they don't (Rom. 8:9). There is no such thing as half-pregnant.
I also accept the Biblical definition of sin is literally, "to miss the mark." What is the "mark?" The answer is the glory (and perfection) of God (Rom. 3:23). I also believe that God cannot reduplicate or transfer His glory to another without a Mediator. I believe that this realm we exist in of universe, matter, TIME and space, etc., was created by God in order to "mediate" His glory of holiness and righteousness, etc., into His elect man through His Son, Jesus Christ. I also understand the Doctrine of Imputation as mentioned in 2 Corinthians 5:21 is a nature-swap. Christ is imputed our sin-ful (missing the mark) nature, and we are imputed His righteous nature:
2 Corinthians 5:21 (KJV)
21 For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.
I also believe that when God created the man from the dust of the ground that the image of God was the Son. What better image of a Father is there than a Son? I am assisted also in the knowledge and Scripture that we are being conformed into the image of Christ (Rom. 8:29), not the image of Adam. I believe God was looking at the new man, the hypostatic union, when He created the man from the dust of the ground. I also believe that Revelation 13:8 provides insight that before a righteous God can create an unrighteous being (man) that there was atonement made "from [before the foundation (creation) of the world."
The only way God can create an unrighteous (sin-ful) being was through atonement before He created heaven, earth, and man. Since God cannot reduplicate Himself in Himself that the universe was created in order for Him to bring about His plan for man.