This is not even close to true. The Byzantine Empire was the keeper of all of this western knowledge. The arabs got their texts from them and the Spanish from them and the Byzantines. The arabs did trade texts from India to Europe as well.
https://en.wikipedia.org/wiki/Graeco-Arabic_translation_move...
The Muslims also made original contributions to science, e.g. Ibn Sahl discovering what later became known as Snell's law of refraction.