Hi Matthew,
I had a post, but somehow when I hit submit, it did not load.
Now, I don't have time to write it beautifully, and you will have to do your own foot slog.
If you search for 'Satan', you will find no evidence that he is plural. Remember Job 1 also, and Peter's roaring lion. See Psa 22. Satan doesn't just represent the mind of flesh, he IS the mind of flesh. John 8:44.
Look also at Judas in John 12, concerned more for the money than the worship of God. Idolatry (self worship) is the issue in Rom 1. Compare with first commandment.
Note also, that Rom 2:4 is where Paul is going in Rom 1.
John 10:1. John's verses about antiChrist. John 17:12 and John 13:18 I speak not of you all: I know whom I have chosen: but that the scripture may be fulfilled, He that eateth bread with me hath lifted up his heel against me.
Psalms 41:9 Yea, mine own familiar friend, in whom I trusted, which did eat of my bread, hath lifted up [his] heel against me. {mine...: Heb. the man of my peace} {lifted...: Heb. magnified}
Nevertheless, God has given us an ability to hunger afer righteousness and the ability to know when we have met with Him or not.
Mark 5:6. Legion, though full of demons 'ran and worshipped' Jesus as soon as he saw him. This brings in James 1 on temptation - a man being enticed with the sin within him. Now this is relevant to Rom 1, but, there are many other reasons a person may need to be delivered from other spirits, not necessarily their own personal choice to sin. Be gentle with them.
1 Cor 14:32 lines up with James 1. We have power over our actions. The question is whether we will line ourselves up with God's desires, or, the temptation to follow the desires of the flesh.
Look also at the return of the seventy. Jesus had already got victory over Satan spiritually. He had been the chief cherubim, beautiful, shining in the presence of God's glory - until he wanted others to glorify him instead. See Christ's temptations.
Satan's personal agenda is to take the place of the Son of God as the heir of all things. Note in the tempations he has taken the earth from Adam, and now he offers it back to Christ, whereas Christ has a larger agenda - to reclaim the whole of creation back from the effects of the fall.
I don't think seven other spirits more wicked apply until a man who has been delivered from a spirit, continues in sin. Jesus said to several: Go and sin no more.