Ansar Al-'Adl said:
I don't believe that God creates evil.
We believe that suggestion truly implies that, overall, HaShem has no control of evil because it came into being without His allowing it, and that simply does not work.
But the answer is simply that evil is not a substance, but the absence of a substance - good. So God created Satan and Satan left good. God never creates anyone evil or forces darkness upon anyone.

We also do not believe that evil is something that can be quantified. Evil is simply something that has a selfish purpose. Outside of that, we quantify that which harms us as Evil, however simply because we do not know the purpose of a particular evil does not mean it does not have a HaShem given purpose! When He sees fit to give, He gives, when He sees fit to take away, He takes away. HaShem allows pain and suffering for His own goals, which we may never understand, just as he allows us to live in happiness and prosper for reasons that we may never understand (hopefully because we have merited such).
What I mean is that Good and Evil are human notions that HaShem is outside of! He cannot be quantified by either one, but we can percieve what he does, and he certainly commits acts we can deem Good (such as when he saves a person from certain death) and unquestionably commits acts we deem Evil (such as when HaShem brings about a natural disaster). "I the lord your God do all these things", His purposes are His own, for He need answer to no one.
On a side note: Truly, I have read your narrative of how Satan leaves Allah. Allah allows him to leave untill the dead are ressurected. Whatever Satan does, Allah must want him to do, or surely he would have simply destroyed him without a thought, or never created him knowing what he would do?
