You have a good point. While previous religions used both moral authority and military power, it would be best if religion was not spread by military power, for violence and force are degrading. It is even more grotesque than the nihilistic violence of say, Genghis Khan, for it is evil cloaked in the hypocrisy of righteousness, rather than an honest domination. That being said, is Gnostic Christianity not still a form of Christianity?
(I have no right to watch videos right now)
I would consider Gnosticism to have less in common with Nicene Christianity than Mormonism. Make of that what you will.