The short answer is simply that God doesn't exist. The existence of evil and suffering contradicts fundamental aspects of gods character. Therefore god can't exist
Of course you can argue the theodicies, which attempts to vindicate god in response to evil and suffering that militates against God. However the underlying problem lies. as hard you can try to justify evil and suffering, not all suffering is good/just.
"Either god cannot abolish evil/suffering or he will not; if he cannot he is not all powerful; if he will not he is not all good"(Hume-i think). Anyways this quote simplifies the issue of evil/suffering. It's existence directly challenges the qualities of God. So either god doesnt exist. Or he does but is not all good or all powerful. The biblical gods can't exist however it's more likely thats a incompetent god exists.