[Sons to Glory!]

So please forgive me for coming late to the party, but can someone summarize what we've determined in these 275 posts?

To facilitate the answer, I have these three questions:

1. What is sin dwelling in man’s flesh (as per Romans 7) and where did it come from?
2. Are there only two sources in the universe?
3. Adam & Eve ate something forbidden in the garden – what got into man?