"In morals he was a professed Platonist, and in religion he inclined to be an Aristotelian"

Plato and Aristotle
GNU Free Documentation LicensePlato and Aristotle - Credit: sailko
Plato was an idealist and rationalist.  He divided reality into two.  On one hand is the ideal, which is permanent, eternal and spiritual. On the other hand is ‘phenomena’ - appearances, things as they seem, associated with matter, time, and space.  Ideals are constant and unchanging while phenomena are illusions which decay and die, and can only ever approximate the ideal.  Ideals are a motivating force, identified with God and perfect goodness. In this two-part reality, the human body is material, mortal, and subject to causation. The soul is ideal, immortal, and has free will.  The soul will always choose to do good, if it recognizes what is good.

Aristotle was a scientist, philosopher and logician.  In Book Eight of his Physics, he describes what he calls the "Unmoved Mover" or "Prime Mover" - the ultimate source, or cause, of motion in the universe, which is itself unmoved. Although the Unmoved Mover is God, it did not create the world, which Aristotle regarded as uncreated and eternal. Aristotle believed that this God was completely unaware of anything external to itself and thinks only of itself.  Worshipping it was thus not terribly useful.