I would ask, threat in what sense? Christianity was obviously not intended to last forever. Its founder predicted that its true practitioners would always be in the minority and that, towards the end of time at least (if not simply at all times) the world at large would try to snuff them out. He obviously wasn't looking for an earthly kingdom and I don't think he expected his teachings to ever truly reach a large number of people, even if they passed through a large number of ears. I'm not sure what success would look like.
I would argue that consumerism, narcissism, and disregard for human life are no more hurdles for Christianity than being weak is for weightlifting. In other words, these three problems are among the objects of Jesus' teachings and could be overcome if only the teachings were consistently applied with effort. For me, then, it's the lack of contemplation and internalization that lead to individual failures. The teachings aren't given a chance to work before they're turned into slogans.
In other words, being sick is not the obstacle to being well - it's just a description of the state we're in. Blaming continuing to be sick on being sick is akin to holding the script from the doctor and wondering why the medicine isn't working yet.