Islam wasn't just an empire that permited the diffusion of Eastern technology towards the West, and who permitted the travels of people, good an ideas from Spain to China's borders.
There's something else: it was something completely NEW. That's why it wasn't afraid of integrating Persian, Greek or Christian knoledges into its own culture. If, let's say, another empire, with a more longstanding tradition had replaced him, they might not be so willing to adapt the cultural advances of the beaten. I picture, for example, a Zoroastrian empire, or, especially, a Bizantium Empire, arriving to India and don't paying attention to it's numerical system, considering it something done in Hindu Temples, an thus, diabolic (something us what the Spanish did in America).