Theists, what are your explanations for your God letting people suffer and letting animals die in painful ways for hundreds of thousands of years before humans?
Premise 1: If God is omnibenevolent He would want to fix all forms of suffering. Premise 2: If God is omnipotent He can fix all forms of suffering. Premise 3: if God is omniscient God is aware of all forms of suffering and evils in the world. Conclusion: God either lacks one of those attributes or He does not exist.
Despite God wanting to fix all forms of suffering, being able to fix all forms of suffering, and being aware of all suffering in the world, we still see it. The most logical conclusion is then that God does not exist, unless one of those premises is false.
The challenge is to give one explanation that does not either require 1. Instrumentality: God using x as a means to bring about y when it could have otherwise been avoided. 2. Natural evils: Even if moral evils exist as a condition for free will, that still doesn't explain natural evils unrelated to human agency. 3. Gratuitous evils: Even if some evils are a condition for moral growth and betterment, and they somehow couldn't be avoided, we see many kinds of evil that look completely unnecessary and gratuitous. 4. Distribution: If evils are for moral betterment and a condition for virtues, then why are they so unevenly distributed?
No theist has an answer to this problem that can avoid all these objections, and thus the most logical conclusions is that the deity he or she believes in does not exist.