Is the immortality of the soul, BASED ON GREEK PHILOSOPHY?
It depends. One way to think of it is that the soul isn’t immortal of itself, only because God sustains it somehow (this differs significantly from the Platonic view, which disconnected the afterlife from the purposes and the power of the nous). Jesus and the earliest Christians taught not primarily about the soul, but about the resurrection of the dead. This referred to the bodily raising of a person from the dead; an eternally disembodied existence was not part of the picture.