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

[Nihilist Virus]

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?

1.) The last dozen verses of the gospel of Mark are known to be a forgery. There are even alternate endings in very early manuscripts. This is known fact. The earliest copies end after the young boy in the tomb (who later becomes an angel in the other gospels) informs the women that Jesus is risen. The actual postmortem appearances of Christ are forgeries.

2.) The forgery was inserted later as a revision.

3.) Divinely inspired works should not require a revision.

4.) Divinely inspired works should be divinely protected from alterations. While a deity might allow a person or group of people to make alterations (you know, free will and all), it is difficult to believe that said deity would allow a forgery to become the widely accepted version of the work. The forgeries in Mark became canonized and are thought to be holy scripture.

5.) It is not reasonable to believe that a deity would inspire a work and then offer it no protection unless the text is only meant to be of use for a short period of time.

6.) The Bible is supposed to endure forever, or at least for the duration of earth's existence.

7.) It is not reasonable to believe that the gospel of Mark is divinely inspired.