Warning: This article might cause headaches. (Knowledge of cosmology might lessen the headaches.)
Context (Al Big Bang)
The Big Bang Theory puts forward that 13.7 BILLION years ago, all the matter in the universe (watch the video) was concentrated into a single INCREDIBLY TINY point. This began to enlarge rapidly in a hot explosion, and it is still expanding today.
Also, when watching the video, notice that there’s an edge (boundary) to the expanding universe. Whether we can observe it or not, there’s going to be an edge to the universe (because it’s finite).
Here’s the question, though. “Where was this blob of matter in/on before Al Big Bang?”
Space and Time
So, there’s thing concept of space and time (space-time). For us to say that, the book is on the table means, among many things, that there is something beyond the thing called the book, and that it is currently there (i.e., present tense) = space and time.
Okay, close your eyes and imagine what this ‘space’ or ‘time’ is beyond our universe. Imagine that you’re at the borders of this universe (which is continually expanding). Like on the tip of the waves of a sea that is expanding. Now, picture what you see beyond this universe (whats the sea expanding onto?). Can you?
What images you end up imaging will most probably be a result of what you know and have experienced in your life AND WHAT YOUR BIOLOGY ALLOWS YOU TO IMAGINE.
No Space No Time
All of us can entertain the possibility of ‘no space’ and ‘no time’, but what that will ‘look’ like is something beyond our comprehension/capacity.
So, when people ask questions like, “Who created God” or ‘Who created Allah” they are only using cognitive capacities limited by our biology.
It’s impossible to ‘imagine’ a situation where (or how?) time doesn’t exist.
“Nor There is to Him any equivalent” (Holy Quran 112:4)
So, the answer to the question, ‘Who created Allah,” is that the question, in itself, is invalid.
Allah SWT has no end and no beginning, since, He is the creator of all things, including time. For lack of better words, he is without (as opposed to ‘within’) time.