It doesn't make sence to me.
Narkissos, explained it pretty well, so I suggest looking closely at what he had to say.
I will be a little more blunt. Generally (not always) Christians embrace a very definable and diminutive, anthropomorphic image of the Divine. To which they intensely identify, which places them (in their eyes) into a separate group of the "saved" or God's "chosen". For a Christian it's about separating themselves from everyone else: all of us sinners and evil ones. Again, I am speaking in generalities here.
Gnosticism, is a view of spirituality outside such a conditioanl and restrictive box. It's about what unites us one and all. In other words it's a much wider understanding of the Divine which many Christians find threatening to thier grossily confined and constrained views which makes them special.
Fundamental Christianity's diminutive god leaves much room for inflation of the ego, whereas Gnostic Christianities limitless view of the Divine leave little if any room for the ego, and so can lead to the egoes death. It seems it takes a certain readiness to be open to something so radical in nature. IMO.
j