Could you expand on that?
What I mean is: why would biblical scholars automaticaly be biased infavor of one position over another?
Certainly in the past and even today, most of those who go into bibical scholasticism were raised in a Christian culture which assumed the historicity of Jesus, usually by Bible-believing families, and very often get to such study through seminaries or religious universities. Please don't ask me for a scientific study proving my case. I'm giving you my impression of the state of things, though you're welcome to offer contrary evidence if you have it.
In other words, these are for the most part not secular guys who just decided to devote their lives to an historical study of the Bible. They are biased, even if simply raised in a culture which assumes the historicity of Jesus but especially if they have come to it through any devotion to the Christian religion. Most people have a very difficult time throwing off the assumptions of their upbringing.
Add to that the investment which these scholars have in the historical Jesus. If they take the position that 'Jesus didn't exist,' they'll be marginalized, even attacked by their peers, and they won't be able to play the who-was-Jesus game anymore.
Also: in your opinion does this also apply to historians in general?
Good question. My answer is, "Not so much, except for those historians who focus on specific historical figures. Those historians can be as biased and self-interested as Biblical scholars."
I once read a biography of Alexander the Great, written by an Englishwoman. Except I didn't read it; I listened to it on tape, and it was read by the author.
You should have heard the emotion in her voice. There was lots of anger at those historians who disagreed with her. I remember in particular when she came to the story of the Gordian Knot. She was outraged that people believed that Alex had cut it with his sword, and cheated, rather than that he figured out how to untie it.
So, yeah. I think biographers of secular figures can be almost as biased as scholars of Jesus.