First here's some Webster definitions to refresh your memory:
Pantheism:
1 : a doctrine that equates God with the forces and laws of the universe
2: the worship of all gods of different creeds, cults, or peoples indifferently; also : toleration of worship of all gods (as at certain periods of the Roman empire)
neo-Platonism:
Platonism modified in later antiquity to accord with Aristotelian, post-Aristotelian, and eastern conceptions that conceives of the world as an emanation from an ultimate indivisible being with whom the soul is capable of being reunited in trance or ecstasy
"What about the Middle East? Many of us do not realize that, historically, Islamic thinkers drew on ancient Greek sources just as heavily as Western thinkers did, so that neo-Platonism spread to Arabic cultures as well. During the Golden Age of Islam in the seventh and eighth centuries, Muhammad's armies swept out from the Arabian peninsula, annexing territory from Spain to Persia. In the process, we might say, they also annexed the works of Plato, Aristotle, Plotinus, and other Greek thinkers. As a result, the Arab world had a rich tradition of commentary on the Greek philosophers long before Europe did. In college history courses, we often learn that the Renaissance was sparked by the recovery of ancient classical writings. But we rarely learn it was Muslim philosophers who had preserved those texts and who reintroduced them to the West.
As a consequence, neo-Platonism became a strong influence on Islamic thought. Today several leading Muslim philosophers have embraced perennial philosophy, with its merging of Western and Eastern pantheism. In fact, the early proponents of this philosophy, who were Europeans, all ended up converting to Islam! To complete the circle, the man who launched perennial philosophy (a Frenchman named Rene Guenon) believed there was actually a common core uniting all three: neo-Platonism in the West, Hinduism in the East, and Islam in the Middle-East.
Since September 11, we have heard it said again and again that Islam is just another Abrahamic faith--as though it were not really very different from Christianity. So it may come as a surprise to learn that the god of Islam is actually more akin to the nonpersonal Absolute of neo-Platonism and Hinduism than to the God of the Bible.
Yes it is true, and the central reason is that Islam rejects the Trinity. Without that concept, it cannot hold a fully personal conception of God. Why not? Because many attributes of personality can be expressed only within a relationship--things like love, communication, empathy, and self-giving.
Traditional Christian doctrine maintains a personal conception of God because it teaches that these interpersonal attributes were expressed from all eternity among the three Persons of the Trinity. A genuinely personal God requires distinct 'Persons,' because that alone makes it possible for love and communication to exist within the Godhead itself.
Islam denies the Trinity, however, which means there is no way for its conception of God to include these relational attributes. (At least not until He created the world--but in that case He would be dependent on creation). That's why it is correct to say, as some Islamic philosophers do, that Islam is actually akin to neo-Platonism and Hinduism.
This nonpersonal conception of God also explains why Muslims express their faith in near-mechanical rituals: Muslim believers recite the Koran over and over, in unison, word for word, in the original Arabic. They don't pray to God as a personal being, pouring their hearts out to Him as David did, or arguing with him as Job did. As one Muslim website puts it, 'understanding [the Koran] is secondary' to recitation and ritual, which makes sense only if God is not a personal being. As sociologist Rodney Stark explains, religions with nonpersonal gods tend to stress precision in the performance of rituals and sacred formulas; by contrast, religions with a highly personal God worry less about such things, because a personal Being will respond to a personal approach through impromptu supplication and spontaneous prayer."
-Nancy Pearcey pgs 387-388
from: http://www.amazon.com/Total-Truth-Study-Edition-Paperback/dp/1433502208/ref=sr_1_1?ie=UTF8&qid=1346348621&sr=8-1&keywords=total+truth