The same problem that Charles Darwin (who was a religious man to begin with) had with Ichneumonidae. This is a wasp species that lays its eggs inside the larva of another creature and the wasp larva when hatched eats the host larva alive. He wrote about it and said there was too much misery in the world. Nature seemed cruel to Darwin but of course nature is just nature, 'red in tooth and claw' as Tennyson wrote around the same time. Poisonous snakes, spiders and scorpions that kill many humans each year. What was God thinking creating these, did he have an off day!
Human cruelty without interference from this so-called loving god. Where is he? The 'free-will defence' of Christian tradition is that God could not allow humans to have free-will without the possibility that they would do evil things. This doesn't wash with me because any divine being would know that there is little free- will for people who are suffering under authoritarian regimes. In these circumstances the free-will of a few dictators destroys the free-will of others.
This does not account for natural disasters which even insurance companies still call acts of God. Disease takes many lives every year including those of children.
The religious arguments to answer these questions seem convoluted to me now. Occam's razor shows that we should proceed to simpler theories first until a greater explanation is needed. Therefore to give log-winded explanations which involve Adam and Eve, talking serpents, a man being tortured to death on a cross is multiplying entities beyond necessity according to Occam. In other words adding more and more theories to explain the apparent discrepancies in nature that a belief in God causes. To me the obvious answer became the simpler one, that nobody is in charge.
The only thing that solves all these problems for me is that nature is not cruel it is simply not guided by an omniscient intelligence. Evolution is blind and seemingly cruel in that it preserves the species rather than the individual. We got here by accident and people suffer from genetic errors or diseases in their bodies because these bodies evolved, as did viruses and bacteria. There is no perfection in evolution, only gradual adaptation. There are earthquakes and volcanic eruptions because our universe and this planet came into existence through natural forces and movements of tectonic plates is continual. Humans suffer at the hands of other humans because we are apes and apes are sometimes aggressive and violent. They are also intelligent, resourceful and they cooperate which gives me great hope for this beautiful world.