Are you saying that in Buddhist thinking a particular enlightened person will continue to exist as a distinct entity and will be reincarnated, just with greater humility? This is very far from my impression of Buddhism, which is that it holds all individual existence to be an illusion and seeks mental state in which oneās individuality is annihilated and one realizes that everything is nothing, or rather that there is no difference between being and non-being, true and false, me and you, etc. A complete suicide of the mind. I might be wrong about this as I have not given the subject extensive study, and in any case there is certainly diversity within Buddhism.
Such a mentality is not to be found in Christian saints. Their humility makes them all the more acutely aware of their individuality, of their littleness before God and of the dignity and needs of other people. We do not generally imagine such an evil as nirvana to befall even those in hell, although C.S. Lewis came close to it in his speculations about the damned.