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Here's an excerpt from Bart Ehrman on How the Problem of Suffering Ruined His Faith:
Eventually, while still a Christian thinker, I came to believe that God himself is deeply concerned with suffering and intimately involved with it. The Christian message, for me, at the time, was that Jesus Christ is the revelation of God to us humans, and that in Jesus we can see how God deals with the world and relates to it. He relates to it, I thought, not by conquering it but by suffering for it. Jesus was not set on a throne in Jerusalem to rule over the Kingdom of God. He was crucified by the Romans, suffering a painful, excruciating, and humiliating death for us. What is God like? He is a God who suffers. The way he deals with suffering is by suffering both for us and alongside us.
This was my view for many years, and I still consider it a powerful theological view. It would be a view that I would still hold on to, if I were still a Christian. But I'm not.
About nine or ten years ago I came to realize that I simply no longer believed the Christian message. A large part of my movement away from the faith was driven by my concern for suffering. I simply no longer could hold to the view—which I took to be essential to Christian faith—that God was active in the world, that he answered prayer, that he intervened on behalf of his faithful, that he brought salvation in the past and that in the future, eventually in the coming eschaton, he would set to rights all that was wrong, that he would vindicate his name and his people and bring in a good kingdom (either at our deaths or here on earth in a future utopian existence).
We live in a world in which a child dies every five seconds of starvation. Every five seconds. Every minute there are twenty-five people who die because they do not have clean water to drink. Every hour 700 people die of malaria. Where is God in all this? We live in a world in which earthquakes in the Himalayas kill 50,000 people and leave 3 million without shelter in the face of oncoming winter. We live in a world where a hurricane destroys New Orleans. Where a tsunami kills 300,000 people in one fell swoop. Where millions of children are born with horrible birth defects. And where is God? To say that he eventually will make right all that is wrong seems to me, now, to be pure wishful thinking.