The Aramaic Alaha, the common name for the Divine in the language that Jesus spoke, is in turn related to the Arabic Allah: ‘The God’, and the Hebrew: Eloah [Elohim, Elohai]. It was originally a loose reference to a regional deity and in-time appropriated into emerging Islam.

The principle prayer of Islam, the Shahadah reads:
La Ilaha il al-Lah’: ‘There is no God if it be not the God’.

It is an informed rendering of insight as Self-Eating Expression meant for the trained ear and in the language of the day. [But try explaining that to a modern day Mullah].

You may never re-present [express] Al-lah, the fundamental sin of Islam [Shirk]. ‘Allah forgives not that partners should be set up with Him, but He forgives anything else, to whom He pleases, to set up partners with Allah is to devise a sin most heinous indeed’ (Qur’an 4:48).

The Kaaba in Mecca is an empty cube.