Ain't gonna happen. The Catholic Church would never accept a one-world government that wasn't wholly owned and operated by the Catholic Church, and the rest of the secular world is not about to let that happen ever again. it was pretty much a disaster last time.
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“Trouble rather the tiger in his lair than the sage among his books. For to you kingdoms and their armies are things mighty and enduring, but to him they are but toys of the moment, to be overturned with the flick of a finger.”
― Gordon R. Dickson, Tactics of Mistake
― Gordon R. Dickson, Tactics of Mistake