Yeah that's for sure. I used to consider myself somewhat of a Gnostic and thought it and Satanism was cool and harmless. Teenagers in these phases are completely unaware of how evil the real practitioners are, they should do some research into what these people really practice. It was Death Metal and Soul Reaver 2 that did it for me. I was under the impression that Christianity was part of the system, the system that I intuitively knew was evil since I was a child, what a fool I was. But it's not a loss that I had this phase, my gnostic indoctrination allowed an actual Mason to confide in me one of their secrets that they aim to destroy christianity. It became clear Masons are part of why the system is evil and Christianity is good.
It depends on what you mean by Christianity. It is obvious to me beyond a doubt that Jesus' teachings are very good, whether the organized church is good is a different matter entirely