Are the names of all people originally written in the Book of Life?

There is a difference in the translation of my bibles Revelation 13:7-8:

"It was permitted to wage war with the holy ones and conquer them, and it was given authority over every tribe and people and tongue and nation. 8 And all those who dwell on the earth will worship it. From the founding of the world, not one of their names has been written in the scroll of life of the Lamb who was slaughtered."*

My bibles translation implies that from the founding of the earth up till Armageddon, that the book of life isn't finished. This means then that based on decisions we make that we can be wiped out of the book of life.

God knows our very thoughts and intentions Psalms 139:1-3:

"O Jehovah, you have searched through me, and you know me. 2 You know when I sit down and when I rise up. You discern my thoughts from afar. 3 You observe me when I travel and when I lie down; You are familiar with all my ways. 4 There is not a word on my tongue, But look! O Jehovah, you already know it well."

So God can see our motives. He knows what we are going to do before we do it because he knows our intentions. Does this mean that every action is predestined? Not exactly, to illustrate this think of a man who had caught on fire. It hurts and he doesn't want to be burned. You are then reasonably assured he will put it out. Does this mean that because you knew he would do so that you caused him to put it out?

This makes sense when you consider free will and Jesus' sacrifice. God can give us his holy spirit so that we can take in knowledge of him. God doesn't force us to follow him. He gives us the choice and the 2 roads are in front of us for us to choose.

An example of this is Exodus 32:32&33

"But now if you are willing, pardon their sin; if not, please wipe me out from your book that you have written.” 33 However, Jehovah said to Moses: “Whoever has sinned against me, I will wipe him out of my book."

This shows that the disobedient Israelite's had been in the book of life before this took place. Because of their actions, or sin, God was going to wipe them out of the book.

So rather than everything being already written, I would imagine that the book of life is being constantly updated according to our actions. Another example is Revelations 2:10:

"Do not be afraid of the things you are about to suffer. Look! The Devil will keep on throwing some of you into prison so that you may be fully put to the test, and you will have tribulation for ten days. Prove yourself faithful even to death, and I will give you the crown of life."

In regards to the free will comment above, let me use an example to illustrate my point. If I, as a father, know my son's favorite ice-cream is vanilla, and I am taking my family to the ice-cream store, and I right a note to my wife with a grin and say in the note "he's going to get vanilla." Then we get to the store, he is given the choice as to what to order, and he looks at all the flavors and he orders vanilla. I did not make him order vanilla. He ordered it because he wanted to. But I knew what he was going to order. God is not contained by time, He is omniscient. He is also omnipresent, all-powerful and all-knowing. God just is. He is right now at the beginning of the world. He is right now also on the cross of Calvary. He is right now also at the end of the world. 1 trillion years from now... God is! So, just because God knew what each person would decide, does not remove the choice from each person, it just means we serve a God who is all-knowing. He can look at the end of the story of our lives and see the choices we made and... without moving... write our names in the Book of Life before the foundations of the world! What an awesome God we serve! If we had no free will, there would be no need for Jesus to have died to save us. He would have already decided who was going to heaven. But because He wanted to make the choice that we do have even easier, He died for us. Because He wants us to make the right choice knowing that He loves us that much.

I like to think about this as matter of perspective.

Everything agree that God is omniscient, so He knows everything in the space and time. "Before the foundation of the world", God knows and write in the book of life the names of the saints. But that names are no reveleated to anyone, men or angels. Note the verse that you cited:

and another book was opened, which is [the book] of life

opened = the contents were revealed.

It's obvious that God knows the contents, but all creation don't know it.

From our viewpoint the names are writen and erased over time, just because we don't know the original contents... And it is the better (and safer) thought that we need:

Matthew 24:13 KJV
But he that shall endure unto the end, the same shall be saved.

In short, from God's viewpoint the book is immutable; from creature's viewpoint, the names can be added (on salvation proccess) or removed.

Regarding Psalm 68:29 -- it is an illogical premise to suppose that because scripture refers to "not blotting out" that there is the ability to blot out.

Clearly, scripture indicates that the names of God's people were written in the Book of Life before the foundations of the world. God is sovereign. Scripture indicates He choose whom He wants, not based on anything they do. We are born again via God alone, not by human will or desire. These are the names in the Book.

As with many issues I start with the Summa Theologica (Summary of Theology), by Thomas Aquinas. Here is one section of use: http://www.newadvent.org/summa/1024.htm#article3.

Here is an interesting quote:

"Let them be blotted out from the book of the living" (Psalm 68:29).

So, yes, people can be blotted out of the Book of Life.

We may think we know who should be in that book, as we feel that person is achieved a particular level of holiness, but, God knows all, so there is information He will have that we don't. So, we may feel someone is definitely going to Heaven, but later they do something that casts doubt on that, so we say they may have been removed from the Book, when they may never have been in there in the first place.

This also leads to the idea of predestination, that Aquinas covers in two parts that help here, but that goes beyond the answer to this question, so I will just give references. This one deals with whether the Book of Life is predestination http://www.newadvent.org/summa/1024.htm#article1

And whether those predestined for Heaven are chosen by God. http://www.newadvent.org/summa/1023.htm#article4