Romans 8:38-39 ("nor angels")

"For I am convinced that neither death, nor life, nor angels, nor rulers, nor things present, nor things to come, nor powers, nor height, nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord" (Romans 8:38-9 NRSV).

I've heard it suggested that the angels who cannot separate Christians from God's love in Christ Jesus are not demons, but holy angels. Or some claim they're possibly "angelic" humans in the ecclesia. However,  Paul evidently uses the word "angels" sometimes to reference demons. See 1 Corinthians 4:9; 6:3; 11:10; 13:1; 2 Corinthians 11:14. Compare the usage in 2 Corinthians 12:7; Galatians 1:8; 4:14.

Douglas Moo (The Epistle to the Romans, page 545):

Comments From Augustine of Hippo on Romans 5:12

Augustine of Hippo has some interesting remarks pertaining to Romans 5:12:

"But if the apostle had wished to assert that sin entered into the world, not by natural descent, but by imitation, he would have mentioned as the first offender, not Adam indeed, but the devil, of whom it is written, that 'he sinneth from the beginning'; of whom also we read in the Book of Wisdom: 'Nevertheless through the devil's envy death entered into the world.' Now, forasmuch as this death came upon men from the devil, not because they were propagated by him, but because they imitated his example, it is immediately added: 'And they that do hold of his side do imitate him.' Accordingly, the apostle, when mentioning sin and death together, which had passed by natural descent from one upon all men, set him down as the introducer thereof from whom the propagation of the human race took its beginning" (On the Merits and Forgiveness of Sins 1.9).

Alternate Image of Fitzmyer's Remarks On Romans 9:5 (Testing)

 

Joseph A. Fitzmyer's Analysis of Romans 9:5 (Anchor Bible Commentary)