Here is the series of posts on Romans 5:12. I do not take the traditional view — that the verse is about the transmission of Adamic guilt. I think it is inserted into the text. However, all humans are sinners (presuming they are allowed to live) and in need of Christ for salvation (i.e., salvation is only through Christ and is not merited in any way). For my reasons and what I think, see the list.
1. Romans 5:12 – What it Says and What it Doesn’t Say Part 1
2. Romans 5:12 – What It Says and What It Doesn’t Say, Part 2
3. More on Romans 5:12 (Part 3)
5. Romans 5:12, Part 5: A Few More Replies to Replies
6. Back to Romans 5:12 – Replies to Reader Comments
7. Some Brief Thoughts on the “Sin Nature” and Reader Follow-Up
9. A Brief Note on Contextualizing the Bible (Especially OT)
10. Adam’s Sin and Old Testament Theology
11. Paul, Original Sin, and Rabbinic Theology
12. A Side Note on “Corporate Solidarity”
13. Romans 5:12 and Universalism: Applying My Take on Romans 5:12 to the Problem