A question a non muslim or even a fellow muslim might ask you is, does Allah forget? Meaning can we attribute forgetfulness to Allah? As a muslim you will probably jump up and say of course not! But this is how you really should respond. Shaykh Ibn 'Uthaymeen was asked, can we attribute forgetfulness to Allah? He replied:

Forgetfulness (Nisyaan) are of two types. The first being forgetting something that you already knew, and this type of forgetfulness never happens to Allah the Most High.

Allah says:

قَالَ عِلْمُهَا عِندَ رَبِّي فِي كِتَابٍ لَّا يَضِلُّ رَبِّي وَلَا يَنسَى

[Moses] answered: "Knowledge thereof rests with my Sustainer [alone, and is laid down] in His decree; my Sustainer does not err, and neither does He forget."

As for the second type then it is (a choice) leaving off something of knowledge knowingly, and this is attributed to Allah by Himself

فَذُوقُوا بِمَا نَسِيتُمْ لِقَاء يَوْمِكُمْ هَذَا إِنَّا نَسِينَاكُمْ وَذُوقُوا عَذَابَ الْخُلْدِ بِمَا كُنتُمْ تَعْمَلُونَ

So taste (the punishment) because of you forgetting this meeting of yours (day of judgement) verily We have forgotten you, and taste the everlasting punishment due to your own deeds.

And Allah says about the Munaafiqeen

نَسُواْ اللّهَ فَنَسِيَهُمْ إِنَّ الْمُنَافِقِينَ هُمُ الْفَاسِقُونَ

They forgot Allah so He forgot them, verily the Hypocrites are indeed Faasiqoon.