The Shahada, or Islamic Creed, simply states "La ilaha illa Allah wa-Muhammad rasul Allah." As you can see, "allah" simply means god in Arabic. Just as "el" means god in Hebrew. Jewish people refer to God often as "Elohim" frequently in prayers, with "Elohim" technically being the plural form of "Eloah." In Arabic languages, 'al' means 'the' and '-ilah' means god. The Shahada reminds me of Sh'ma Israel, which goes like this: "Sh'ma Yisrael Adonai Eloheinu Adonai Ehad." For Jews, this is a common prayer. It means, "Listen, Israel! The Lord is our God, the Lord is One." Adonai means Lord, and Eloheinu is a form of El, meaning "our God."