According to Quran yes He is omniscient:
=() Quran 49:16 ” Pickthall: Say (unto them, O Muhammad): Would ye teach Allah your religion, when Allah knoweth all that is in the heavens and all that is in the earth, and Allah is Aware of all things ”
=() Quran 8:17 “Yusuf Ali : … Allah is He Who heareth and knoweth (all things).”
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Though Allah knows everything still he tests people:
=() Quran 29:2 ” Pickthall: Do men imagine that they will be left (at ease) because they say, We believe, and will not be tested with affliction? ”
=() Quran 29:3″ Pickthall: Lo! We tested those who were before you. Thus Allah knoweth those who are sincere, and knoweth those who feign. ”
=() Quran 2:155″Sahih International: …And We will surely test you with something of fear and hunger and … ”
=() Quran 67:2 ” Sahih International: [He] who created death and life to test you [as to] which of you is best in deed – and He is the Exalted in Might, the Forgiving – ”
Here comes this question:
a)universe in any form and shape with everything in it was created by Allah at point (A)subsequently that means it did not exist before point (A).
accepting this fact brings us to next point>>
b)then the claim that Allah knows everything is false.How he knew the past (before point A) which does not even exist?
The last point is this>>>
Now , why would Allah need to test us if he already knows the result and everything?(even things that did not exist).
c)If universe exist with no point of start in any form then Allah and universe they both are beginingless then Allah did not create universe.