Why can't God sin?

[Nobody]

During the fast, would it have been a sin for Jesus to give into those temptations?

Was Jesus fully God?

It depends on which scriptures you read. John 14:28, has Jesus claiming god his father is greater than he. So that would indicate Jesus is saying he is not god the father.

While John 10:30 has Jesus saying he and the father are one.
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The writer of Hebrews 2 :9 didn't think so. (At least not durning that 40 days and the following trials.)http://www.biblegateway.com/passage/?sea...ersion=ERV

Read the whole section 5-18 to give yourself the proper context.

According to the Hebrews 2 text durning that period Jesus "was made lower than the angels" meaning he was made to endure those trials just like any other man.
[/quote] [/quote]Made lower than the angels, aka/emissaries between god and man, can indicate Jesus became human and was not fully divine being the son of man, born of woman into the flesh.

The writer of Hebrews is purportedly the apostle Paul. Who was formerly known as "Saul of Tarsus". He was a Pharisee who was charged as Saul with pursuing, prosecuting and presiding over the execution of early Christians.

He became a self proclaimed disciple of Jesus and met with conflict and denial from the other true disciples/apostles of Jesus who actually knew him in the flesh. This is until Luke, who would come to work for Paul as his scribe when he assumed the Apostle title, and Peter, both concurred Paul's insights into the will of the Christ post ascension must indicate he was truly in communication with the ascended spirit of Christ who now allegedly spoke to and through him.

However, a careful read of the new testament scriptures, all originally written in Greek and 2/3rds of which were attributed solely to the letters of Paul, lead one to realize much of what Paul claimed as the will or teaching of Jesus, after his ascension back into heaven, contradicts what Jesus said while on earth.
Furthermore, the reason many claim Paul lied and was actually either consciously or unconsciously in league with the adversary of Christ's mission, (the devil), and therefore is the antichrist scripture forewarns against, was that prior to Jesus ascension he informed his apostles that many would come in his name after he returned to the father. They would say he sent them, speak in his name, and perform miracles, but they were false and wolves in sheeps clothing. ( Matthew 7:15-16 & Matthew 24:24)
This certainly describes Paul, who claimed his conversion occurred while on the road to Damascus in route to persecute more Christians, when he and the two male companions that were with him saw a brilliant light appear on the road before them. And then a thunderous voice spoke and asked Saul ; why dost thou persecute me? To which Saul answered, Who are you, Lord?" Saul asked. "I am Jesus, whom you are persecuting," he replied. (Acts 9:4-5)

In a different scriptural account the two companions who were with Saul did not hear this voice speaking to Saul. But they did see the brilliant light and hear the thunder.

Again, biblical contradictions are common in scripture.

However, what further supports those who deny Paul as a true disciple besides all that was the scripture written by John during his incarceration on the isle of Patmos and his writing in the book of Revelation wherein three different times Jesus speaks of the false prophets.

And especially, as many relate this particular passage to Jesus speaking of Saul/Paul; (Revelation2:2)
To the Church in Ephesus

2 I know your deeds, your hard work and your perseverance. I know that you cannot tolerate wicked people, that you have tested those who claim to be apostles but are not, and have found them false.
40 different authors contributed to what became the closed canon that is today's Protestant bible. The autographs that were used to initiate the process are no longer available. So what we have today is the result of not only numerous councils electing both the old and new testaments to come into being, but those 'books' are copies, of copies, of copies, and translations of copies ranging in languages from Aramaic, Hebrew, Latin and Greek.

The scrolls, letters, etc... that were used were in no particular order. Which is why one can not read the bible as they would a regular book and keep the scripts consistent from one book to the next or even as more often than not, one chapter to the next.

It also explains the discrepancies and contradictions, because it was a matter of language barriers being an issue and education also among the scribes translating and rewriting scriptures.
And remember also that the new testament books were all written as much 40 to 50 years after Jesus.

Christianity began as an oral tradition and did not enter print until decades after Jesus died.

Early Christians were called; The people of the book. Because they gleaned their understanding of life and their god by reading about him.
Early Christianity, more aptly to be called "Paulianity" after the author Paul being the primary source for 2/3rds of the NT scripture, was known as the religion of the slaves.

Because while scripture commanded the slaves to be obedient unto their masters, and to obey authorities as they would god because the authorities acted under the will of god, also promised that once they were dead they would be rewarded and live without want in heaven.

So the religion of the slaves was an apt title, because the early apostles ministered to the enslaved populace for the most part, and promised them salvation from their state if they would only now obey their master in heaven.

"God is a metaphor for that which transcends all levels of intellectual thought. It's as simple as that." Joseph Campbell