Do you mean source criticism or form criticism or redaction criticism or.....?
"Moses never wrote the Pentateuch; it was composed by 4 sources"
Yes I know. J, P, D and E.
"Most of the Old Testament historical books' events were made up, or the history was distorted, or the events contradict themselves in their teachings."
Crap. Much of it can be directly verified from Babylonian and Assyrian sources.
"Solomon never wrote Song of Songs or Ecclesiastes"
So what?
"Most of the prophets did not write the books themed about them; people wrote in their name and falsely attributed it to those prophets."
Isaiah had at least three authors, one of which was the historical Isaiah. As to the others, as far as I know the authorship by a single person is not disputed, and since they are not mentioned elsewhere in the Old Testament, there is no reason why the names should be made up.
"The teachings of heaven and hell were ripped off from the Zoroastrians."
It is possible that Judaism has its roots in Zoroastrianism, but again, so what? The truth of a religion is not a function of its family tree.
Even if you find what you hear on your liberal arts course difficult, it is more likely to be accurate than the tripe you hear from "educated" atheists on here. If you have been brought up in a conservative environment it may take you a little while to get over the culture shock, but once form criticism and all the others have said all they have to say, the Bible is still God's revealed word.