Who wrote the Gospels?
Additionally some scholars have made the claim that the Gospels all used a document they call "Q" even though such a document has never been found. There is however evidence that documents containing information similar to the Gospels were in circulation at the time, but there is no evidence to support whether these documents influenced the Gospels, or the Gospels influence the documents. The similarities exist because they were all speaking of the same real events.
There is no reason to doubt the traditional authors. Many archeological evidences have been found that support places and people that are mentioned in the Gospels. There is also evidence that the Gospels were written during the lifetimes of the people who witnessed the events they described. The 2nd century AD dates that were once given by liberal scholars of the can no longer be held. Traditional views of authorship are continually being confirmed, and the views of the liberal scholars overturned.
Who wrote the Book of Daniel?
Some scholars believe that Daniel was written around 165 BC. They pick this date because Daniel has a long list of prophecies that were fulfilled up until that date. What they often don't realize is that Daniel has additional prophecies fulfilled after that date.
This should make you wonder. How could somebody in the 2nd century BC write real prophecies, while claiming to be someone he was not?
These are some of the reasons they give for dating Daniel in the 2nd century.
Daniel uses Greek and Persian words that would not be known in the sixth century BC, he calls Belshazzar the son of Nebuchadnezzar, and he talks about Darius the Mede, a figure that cannot be directly identified.
The critics look for elements that agree with what they know and believe about history. Therefore they require of Daniel things that either are not relevant or are simply mistaken.
First, the book of Daniel was translated into Greek around 270 BC. This would be one hundred years before they claim it was written. Secondly, Daniel uses Greek words to name Greek musical instruments and Persian words to identify Persian political offices. What's unusual about that? Daniel served the royalty of Babylon, who most certainly had access to instruments from other cultures. Daniel was present when the Persians took control of Babylon and set up their political structure. Daniel is also correct in calling Belshazzar the "son" of Nebuchadnezzar. Although Belshazzar was his grandson this was and still is in some cultures a correct usage of the term "son". The fact that Darius the Mede is not mentioned in secular history could be that we don't have all the documents or that Darius the Mede was a title and not a name. But it's not proof that Darius the Mede was not a historical figure.
The reasons given to doubt that Daniel was actually a prophet in the 6th century BC are not valid in most cases and unverifiable in others.