[drstevej]

When Paul wrote Romans did God know he would write it or did God breathe it through Paul?

[The Grammarian]

When Paul wrote Romans did God know he would write it or did God breathe it through Paul?

Both. And this is irrelevant to a discussion of the main issue with "predictive prophecy," which is that 'foreknowledge' somehow interferes with one's free agency.

[xzins]

When Paul wrote Romans did God know he would write it or did God breathe it through Paul?

You treat God as if he doesn't plan and follow through on his plans. "Holy men of old were MOVED..." God initiates scripture.

Paul didn't initiate the writing of Romans, God did. As part of fulfilling His plan, he must necessarily overcome any opposition.