I am saying that Gnosticism exists within many religions as a actual sects with unique views. It isn't necessarily just a large definition, because depending on the faith, there are significant differences. In terms of Christianity, Gnostics often focus on symbolic meaning and put much stock in that. Really, many Christians, perhaps even more Jews, approach the texts with the understanding that it's not all meant to be literal. However, Gnostics differ, as they usually suggest larger symbolic meaning within the entirety of the faith. There are many books removed or never included among the canonized Judeo-Christian texts due to their 'encouragement of gnosticism'. Then again, it shouldn't be a surprise when some gnostics proposed the Christian Messiah a symbolic form -- not physical.

If you're interested do what I do: Study it. When I ask about a religion or their perspective I take that, but also know their interpretation is mixed up with all they are. It doesn't give you a true story about what the faith-community is. So check it out, do some reading if you're interested. I picked up the Gnostic Bible by Meyer and Barnestone personally and am still combing over every bit.