Here's a short story:

Muslims believe the Quran was verbally revealed by God to Muhammad through the angel Gabriel (Jibril), gradually over a period of approximately 23 years, beginning on 22 December 609 CE, when Muhammad was 40, and concluding in 632, the year of his death. Muslims regard the Quran as the most important miracle of Muhammad, a proof of his prophethood, and the culmination of a series of divine messages that started with the messages revealed to Adam and ended with Muhammad. The word "Quran" occurs some 70 times in the text of the Quran, although different names and words are also said to be references to the Quran. 

According to the traditional narrative, several companions of Muhammad served as scribes and were responsible for writing down the revelations. Shortly after Muhammad's death, the Quran was compiled by his companions who wrote down and memorized parts of it. These codices had differences that motivated the Caliph Uthman to establish a standard version now known as Uthman's codex, which is generally considered the archetype of the Quran known today. There are, however, variant readings, with mostly minor differences in meaning. (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: What is the name of the book?
Guess: the Quran
Confidence: <appropriate level of confidence in this guess>

Question: How long did it take to complete?
Guess: approximately 23 years
Confidence: <appropriate level of confidence in this guess>

Question: Who transcribed it?
Guess: several companions of Muhammad
Confidence: <appropriate level of confidence in this guess>

Question: Who gave the message?
Guess: Muhammad
Confidence: <appropriate level of confidence in this guess>

Question: Who spoke to him?
Guess: God
Confidence: <appropriate level of confidence in this guess>

Question: Through whom?
Guess: the angel Gabriel (Jibril)
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: When did Muhammad die?

632