when you say "what is Hand of Allah?", this is asking "howness" which is bid'ah to say the least and forbidden to ask. Allah Ta'ala's Hands are Unique like He is. Right...we can say Allah Ta'ala created Adam with His Two Hands but we can't say the Hands are actually His Hands. How does this make any sense?
Allah Ta'ala is not like anything and He doesn't have jism or parts etc. We simply believe in what He has told us and His Messenger (peace be upon him) has relayed to us and how the Salaf understood it. He told us that He has Two Hands, we affirm and believe in it without getting into these kalami discussions ... PERIOD!
Why does it have to be a part? This is what happens when the kalamis get into "howness" and then accuse us of tajseem when they're the ones who doing it with their kalami arguments. Why can't you just say Allah Ta'ala has Two Hands, which befits His Majesty and end it there? Why don't you say the same thing about other Attributes of Allah Ta'ala i.e. Mercy, Forgiveness?
Why it has to be like ours? You don't say that Allah Ta'ala is like us then why do you say that His Hands must be like ours, otherwise they can't be hands? Humans also have the attribute of mercy, does it prove that Allah's Attribute of Mercy is also like ours? If so, why don't you reject it as well? Why do you accept that but reject this? Akhee, this is the problem with people of kalam!
continued from above ...
Asking what the Hand of Allah is, is not the 'howness', the howness is asking how it performs its function etc and so on. If somewhere it has been defined what the Hand of Allah (SWT) is by a Salaf then we should except it perhaps.
So you confirm Allah (SWT) does not have jism or parts - I think others believe the same.
You say He told us He has two Hands, but what is meant by this? Created with Our Two Hands.
We can say the Two Hands of Allah Create
We cannot say the Two Hands of Allah are physical parts of Allah
We cannot say the Two Hands of Allah are anything like our hands
We might claim the Two Hands of Allah are a part of Allah if taken figuratively, but to do so without evidence is speculative and not allowed.
A figurative meaning is not necessarily wrong it could be right, because it does not contradict the criteria in red. But it cannot be made 'aqidah because it is not a matter of certainty.
You ask a question
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Humans also have the attribute of mercy, does it prove that Allah's Attribute of Mercy is also like ours?
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No it does not prove the Mercy of Allah (SWT) is like ours, but on the other hand Mercy cannot be anthropomorphed in to a physical domain, whereas hands are generally understood in the physical domain already.
So you see a middle ground is developing here:
I see clearly:
1) Athari aqidah does not require us to anthropomorph the Attributes of Allah (SWT)
2) 'Ashari aqidah does not reject the Attributes of Allah
However, I see that perhaps both camps as a result of being positioned on opposites sides of the middle see each other on the extremities.
It is for this reason why I still hold that the acceptable positions of 'aqidah according to Ahl-us-Sunnah are Athari, 'Ashari and Maturidi. Let's move on with our Deen now ... this debate will not end with us.