Why did god create evil?

[dtango]

Except that the Egyptians aren't the only people to have believed in a soul (if they did),…

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You are now fighting against evidence.

Preserve me behind you, O Atum, from the decay you reserve for every god and every goddess, for the animals all, for the reptiles all; for each passed away when his soul left after his death; he perished after he passed away. (The Bok of the Dead, Chapter 154, text E. Naville Todtenbuch)

pri (went away) bA (soul) =f (his) m-xt (after) mt (died) =f (he)

… nor is the egyptian tradition the basis for all traditions that did.

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There is life and there is death. Life has something: The spark of life, the spirit in which so many cultures naturally believe. The soul is supposed to be a sort of spirit living after death and that is a notion that a normal, healthy intelligence cannot produce. It was produced in the environment of the Egyptian priesthood because of the texts and because of the way the texts had been exploited by the clergy.
Any peoples believing in the theory of dualism are repeating what the Egyptians taught them.

As I've suggested, if everything you wish to propose rests upon these egyptian texts, limit your conclusions to the egyptian tradition, and those that can be shown to have been directly influenced or created by it.

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Western civilization is based on Roman civilization which is based on Greek civilization which is based on Egyptian civilization, but Western civilization prefers not to mention the Egyptian-Greek part of the story.
Where from did your culture got the idea of the soul?

The list of myths that do not fall under this category is greater than the list of myths that do by a staggering amount, and those are only the ones that we know about, not those that have been completely and utterly forgotten save for a sentence here and there.

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The roots of the humanity and its history are permanently anchored in the Near East. The oldest records of the humanity’s oral traditions were written in Near Eastern scripts and that is what counts, not those recorded millennia later, by the time that, as you say, were utterly forgotten save for a sentence here and there.