How can you prove that the gospel of Mark is not the "word of god"?

[Jehanne]

So this has been bothering me for a while. I am 100% sure that Matthew, Luke and John's gospels were not "divinely inspired" and they are not the "word of god" because of some of the errors I found in them. However, I can't find any errors in Mark's gospel. No historical errors, no theological errors, nothing. In addition to that, I don't see how it contradicts the old testament in any way.

How can you prove that Mark's gospel is not the word of god? Is there anything in this gospel that scholars don't agree with? Is there anything in the gospel that proves that this book was not divinely inspired?

A simple Internet search shows two errors:

1. Wrong Prophet
The very first error in the Gospel of “Mark” appears in Chapter One and is as follows:
It began as the prophet Isaiah had written: God said, ‘I will send my messenger ahead of you to clear the way for you’.  (Mark 1:2)
If you read the book of Isaiah, you will find that he did not say this and in fact, the above passage was mistakenly sourced from the book of Malachi (3:1). Such an error betrays “Mark’s” ignorance with regards to the very scriptures upon which his religion had been built. This error seems to suggest that he was neither a divinely inspired Jew nor was he recording the account given by one.
2. Wrong Priest
Further evidence that the author of “Mark” was neither an associate of a Palestinian Jew nor inspired by an all-knowing God, can be demonstrated by the second scriptural error of this Gospel.
Have you never read what David did that time when he needed something to eat? He and his men were hungry, so he went into the house of God and ate the bread offered to God (the Shew-bread). This happened when Abiathar was the High Priest.  (Mark 2:25-26)
The crux of the message contained within this verse was that the Sabbath need not be observed which is in direct contradiction to “God’s word” in the Old Testament (Exodus 16:23-30). The rule of the Sabbath day as a rest day was so important to the tribal deity of the Hebrews that he commanded Moses to tell his people that anyone caught breaking this rule was to be put to death (Exodus 31:14).
The second and most damning problem with this passage is that Abiathar was not the High Priest at the time David ate the bread, as the author of this Gospel alleged, Abiathar’s father, Ahimelech was (1Samuel 21:1-6). This clumsy error by the author of Mark was later corrected by the author of “Matthew” (Matthew 12:1-8), who deleted the reference to Abiathar as High Priest, which was one of the details that betrayed “Mark’s” ignorance of the Hebrew Scriptures, although “Matthew” wasn’t much better in this regard.

Two factual errors in the Gospel of Mark