The problem of evil is the oldest and most powerful objection to the existence of God. If God is all-knowing, all-powerful, and all-good, why is there suffering? Why do children die of cancer? Why do earthquakes kill thousands? Why does one person torture another? The presence of evil and suffering in the world seems incompatible with the existence of a God of unlimited power and goodness. If God could stop it and does not, God is not good. If God wants to stop it and cannot, God is not all-powerful. If God does not know about it, God is not all-knowing.
The argument deserves genuine engagement. The suffering in the world is real. The objection is serious. The cheap responses (“it’s God’s plan,” “everything happens for a reason”) are intellectually inadequate and insulting to those who have experienced serious loss.
The Quran does not pretend suffering is an illusion. The verse states directly that suffering is part of the human experience, and frames it as a test rather than a punishment.
The structure of the objection
The problem of evil gains its force from the conviction that suffering is genuinely, objectively bad. The conviction is itself a moral claim. It asserts that there is a real standard of goodness against which God’s behaviour can be measured. On a purely naturalistic view of the universe, one without objective moral facts, suffering is neither good nor bad. Particles in motion. Neurons firing. The problem of evil, pursued honestly, is only available to someone who already accepts that objective moral standards are real. The existence of objective moral standards is itself one of the stronger arguments for the kind of God the problem of evil is meant to disprove.
The objection therefore does not start from neutral ground. It starts from a premise that does significant work for theism. The argument may still succeed on balance, but the moral seriousness it requires is something the naturalist has to borrow from a framework they are simultaneously denying.
The logical and evidential versions
The problem of evil exists in two forms. The logical problem asks whether the existence of any evil at all is logically incompatible with the existence of an all-powerful, all-knowing, all-good God. This version has been largely abandoned in academic philosophy, because the logical incompatibility turns out not to hold. A good God could have morally sufficient reasons to permit evil, reasons connected to the creation of a world with genuine free agents, to the development of moral character, to the conditions required for certain goods that cannot be obtained without the possibility of their opposites.
The evidential problem is stronger: even if evil is not logically incompatible with God’s existence, the sheer amount and distribution of suffering in the world, particularly suffering that seems to serve no redemptive purpose, is evidence against the existence of such a God. Why so much? Why children? Why animal suffering before any human consciousness existed?
The free will defence
Much of the evil in the world is moral evil, harm done by human beings to other human beings. The free will defence holds that a world containing genuine moral agents who can freely choose good is more valuable than a world of moral automatons who do good only because they are programmed to. A God who wanted to create the first kind of world had to permit the possibility of the second. The existence of evil is a consequence of the creation of freedom, not a refutation of divine goodness.
The defence has force against the moral evil objection, though it raises its own questions about whether the value of free will is sufficient to justify its costs. It has less direct force against natural evil, suffering caused by disease, natural disaster, and the non-moral order.
The greater goods defence
Some evils appear to be conditions for goods that cannot exist without them. Courage cannot exist without the possibility of danger. Compassion cannot exist without the possibility of suffering. Perseverance cannot exist without the possibility of failure. The development of deep moral character appears to require adversity, because a world in which all suffering is immediately removed is not a world in which certain goods can develop.
The objection is that the distribution of suffering seems disproportionate to these goods. Some suffering appears gratuitous, serving no good that a less costly route could not achieve. The theistic response is epistemic humility: given the limits of human knowledge and the short time scale from which we evaluate these things, our confidence that any particular suffering is genuinely purposeless should be modest.
Suffering as expiation in the Islamic account
The Islamic tradition adds a layer the philosophical defences do not address. Suffering, for the believer, is also a means by which sins are removed and the soul is purified.
The hadith reframes the experience of suffering. The pain remains real. The grief remains real. The accounting that runs alongside the pain is not visible to the sufferer in the moment, and the tradition does not pretend that it makes the suffering pleasant. The accounting does mean that nothing is lost. The same pain that the philosophical defences struggle to justify becomes, in this framing, an active part of the soul’s preparation for what comes next.
The problem of evil and the moral argument
The deepest point about the problem of evil is structural. The problem depends on recognising that evil is real, that certain things genuinely ought not to be. The recognition is only available to someone who already accepts that there is an objective moral order. The existence of an objective moral order is itself evidence for God.
The problem of evil is simultaneously the strongest objection to God’s existence and evidence for the moral order that theism grounds. It does not neatly cancel out. It does suggest that the question is more complex than a simple disproof, and that the very moral seriousness required to take the problem seriously is itself a feature of the world that naturalism struggles to explain.
Taken together, these arguments point to more than a distant higher power. They point to a reality in which the world is ordered, reason can be trusted, and human life stands under real moral claim. The move from generic theism to Islam is therefore not a leap into the dark but a further step toward the most coherent account of the One behind everything. The problem of evil presupposes the very thing it tries to disprove. The moral outrage that fuels the argument requires a moral order grounded in something beyond human preference. Tawḥīd provides that ground. The khalīfah’s vocation does not promise a world without suffering. The promise is that no atom’s weight of endurance is wasted, that justice is not finished at the moment of death, and that the God who designed the test will settle every account in a scope that exceeds what any finite perspective can fully evaluate.