A Comparative study between Al-Ghazali in “The Incoherence of Philosophers” and Ibn-Rushd’ in “The Incoherence of Incoherence” ; their views and the relation to neo- Platonism and Gnocism ; metaphysics of being ; God and the universe ; the problem of the world-oldiness, the cause-effect relationship; the impact of Al-Ghazali and Ibn-Rushd on later philosophers (Moslems & Europeans).