Your description of the foundation of the world is one of an object, not of a time. "From the foundation of the world" would indicate a location.
Wrong. It indicates a point in time.
The point (that I'm trying to make) is that "From/since" the foundation of the world is a figure of speech that means "NEVER".
I have a hard time seeing how that fits with either context.
Supra.
Your question is a good one, though I've already answered it partially. Foundation of the world means the creation of the world, and it can include up to the time Adam sinned, which is when God first promised the messiah, as the one who would crush the serpent's head. Because I don't believe the scripture is referring to someone who was damned to hell from creation, before they ever do anything wrong, before they even exist, I believe it to be a reference to those who don't acknowledge Christ as savior in the timeframe of the passage.
Again, the phrase just means that they have never been in the Book of Life.
Because Rev 13 comes before Rev 17, Rev 17 can be read in terms explained in Rev 13, which DOES mention Christ.
Sure, but that doesn't change the fact that Christ isn't and wasn't being slain from the foundation of the world, so it doesn't make any sense to read it that way.
So if Rev 13 talks about Christ being slain from the foundation (creation) of the world,
It doesn't.
All who dwell on the earth will worship him, whose names have not been written in the Book of Life of the Lamb slain from the foundation of the world. - Revelation 13:8
http://www.biblegateway.com/passage/?search=Revelation13:8&version=NKJV
The beast that you saw was, and is not, and will ascend out of the bottomless pit and go to perdition. And those who dwell on the earth will marvel, whose names are not written in the Book of Life from the foundation of the world, when they see the beast that was, and is not, and yet is. - Revelation 17:8
http://www.biblegateway.com/passage/?search=Revelation17:8&version=NKJV
If BOTH verses had said "the Book of Life of the Lamb slain from the foundation of the world," then at best it would be ambiguous to it's meaning.
But since 17:8 DOESN'T have "of the Lamb "slain," we can know that it isn't saying that Christ was being slain from the foundation of the world, but that "of the Lamb slain" is just the subtitle of the book called the "Book of Life," and that "from the foundation of the world" is modifying the book, not Christ.
and those that won't acknowledge Christ in the present as not written in the book of life from that time, it refers to the fact that men all will die ("be blotted out from the book of life" if alive at creation, but never written in if they are going to die without the saving grace of Christ). And the wicked in Rev 13 and 17 can be described that way--doomed to die because of Adam's sin, and not saved by Jesus Christ.
The problem with this 1) that no mention of "blotting out" is present here, and 2) is that Revelation describes the future history of Israel with regards to the New Covenant God made with her, which, while undergirded by God's grace, also requires that the people who are under the New Covenant keep the law. They are added to the Book of Life of the Lamb slain when they put their faith in God, and the only way someone will be blotted out is if they don't overcome their fleshy desires (Revelation 3:5, which is the only time in Revelation where "blotting someone out of a book" is mentioned). That's CLEARLY not talking about the Body of Christ, the members of which are "more than conquerors through Him who loved us." (Romans 8:37) Those who have never entered into the covenant with God (especially at that time) will not have had their names written in the Book of Life, ever. Worse for them, even, is that God, at that time, will be forcing people to "pick a team," so to speak, making it EXTREMELY clear who is on His side, and who has rejected Him. There won't be anyone not on a side.
In other words, Adam was in the book of life until he sinned, then he was blotted out.
Where do you find this in scripture?
Ever since Adam, everybody has been subject to death, even if their sins were not as serious as Adam's (Rom 5:17),
We agree on this.
so they weren't written into the book of life, until Christ came (an exception might be granted for the Israelites, but I'd have to think about that).
Just a thought, but perhaps Romans 4 might have a hint:
But to him who does not work but believes on Him who justifies the ungodly, his faith is accounted for righteousness,just as David also describes the blessedness of the man to whom God imputes righteousness apart from works:“Blessed are those whose lawless deeds are forgiven, And whose sins are covered;Blessed is the man to whom the Lord shall not impute sin.”Does this blessedness then come upon the circumcised only, or upon the uncircumcised also? For we say that faith was accounted to Abraham for righteousness.How then was it accounted? While he was circumcised, or uncircumcised? Not while circumcised, but while uncircumcised.And he received the sign of circumcision, a seal of the righteousness of the faith which he had while still uncircumcised, that he might be the father of all those who believe, though they are uncircumcised, that righteousness might be imputed to them also,and the father of circumcision to those who not only are of the circumcision, but who also walk in the steps of the faith which our father Abraham had while still uncircumcised. - Romans 4:5-12
http://www.biblegateway.com/passage/?search=Romans4:5-12&version=NKJV
Those that believe in Christ are written in.
More accurately, those who put their trust in God are written in. That means something different for Israel, versus the Body of Christ, but both groups must put their faith in God.