Judaism also has important black cubes in the form of tefillin worn by adult male jews during one of their daily prayers on weekdays.

https://en.wikipedia.org/wiki/Tefillin

Also NeXT.

Yes, the kabba is also a nod to Saturn (which is why I said all Abrahamic religions incorporate some Saturn worship into them), and the people walking around the kabba make the rings of Saturn (if you employ some time-lapse photography of them walking around, it's quite obvious). Saturn has a hexagonal shaped storm on its north pole (and the all-seeing eye on its south pole). If you collapse a cube into two dimensions, you get a hexagon.