I'm going to speak in a broader sense, ie the concept of God, as opposed to grounding this in one specific doctrine since that can get messy and a tad confusing. However, the Buddhism, Jainism and Zoroastrianism have some concrete explanations for the world as it is. There are a variety of philosophical explanations for suffering and the continued existence of suffering.
But again, since you bring up the Problem of Evil as your primary refutation of the existence of God, I'm going to have to focus on that.
I'm surprised that you continue to bring up the application of concepts such as love, suffering and duality to a being that, as you previously mentioned, is supposedly unknowable. Do you see the incredible irony there? If, as you say, God is unknowable, then how can you then argue that suffering means that God does not exist, or that God is 'not benevolent'? In a previous post, you brought up Old and New Testament examples of God behaving in a human way to say that God is then not all-good and benevolent, but capricious and vengeful. Ok, however, you are falling into the anthropomorphic trap, the same then if you take the Bible at face value. If you are unwilling to attribute concepts such as love and benevolence on the basis that he's unknowable, why then are you so quick to attribute concepts such as capriciousness, anger and vengefulness to God?
Ultimately, this is probably the simplest contradiction to the problem of evil: what cons utes evil? Is suffering evil? Why then is suffering evil. From our vantage point, disease, poverty all these concepts of suffering, are called evil, but are they really evil? Should they have been averted? A natural disaster here, a death there, in the short term looks bad, horrible, but is it necessary evil and should it have been prevented?
IF God is an omnipotent and unknowable being, why then are human sufferings and frailties attributed to God's lack of intervention? We are arguing from a human perspective, replete with human constructs of the universe (here I'm bringing in another area of study, excuse me). It is much like, attributing human expressions and emotions to non-human animals; it's not something to be done.
Anyway, I can continue to argue against the problem of evil for days on end. But, don't have the time. However, I did want to ask one thing, why do you attribute the concept of a one true God to all religions on the planet? Buddhism, for example, is open to the concept of different paths being taken to achieve God. The Catholic Church actually has a doctrine that is open to the idea that people can take different doctrinal paths to achieve 'Heaven' (naturally though, they think their path is the best). Be careful to not confuse human doctrinal paths to 'Heaven'/Enlightenment/Nirvana as evidence against the existence of God. The evidence is many religions espousing God can be construed, not as a refutation of God, but as evidence that a form of a Supreme Being does exist.