I went through theology classes hoping that I could find some truth in them. I kept arguing and fighting with the instructors. They didn't know what to do with me. They figured I had somewhat of a brain, plus I was a Jewish girl and a Christian convert, so they didn't want to kick me out. But I was troublesome.
Gnostics always address and challenge the issues of the day.
If there is any one book in the Bible that's Gnostic, it's Leviticus, which gives rules of hygiene and of right action. It's not dogmatic, however. Please realize that much of the Old Testament is instructive, but not Divine, discourse. The reason why Jews were forbidden to eat pork in those days was actually because pork was dirty, and there were no curative methods available at that time. This was a manmade decision, not an edict from God.