That always comes down the paradox of free will.
The premise is that God creates the world, creates a perfect couple, then tempts them (for what reason?). They fall into temptation and sin.
He then punishes them for that sin.
Already off to a bad start.
They continue to sin until he decides enough is enough and sends his only son down to earth to offer mankind salvation - but there's a catch, you have to ask for forgiveness, which, providing you mean it, will be granted. Quite why it Jesus to die, I do not know, but providing you accept Jesus, you'll have a channel to God, and hopefully some guidance in life.
Now, that 'guidance' is supposed to be an ongoing relationship with God, but God's message isn't always very clear. Arguably that's down to human error 'cos they don't listen or understand his word properly, or they are also tempted by yet further sin (being forgiven for sin doesn't mean it's the end of temptation, you'll be asking for forgiveness regularly).
Does God create all the bad things? well, there's an argument that mankind carries out wars, not God, and that we have enough resources in the world to avoid starvation. It's our greed that sees half the world growing fat, and half the world starving. It's our greed that sees people in poverty as well as incredible luxury.
However, it's very very difficult to comprehend why a Tsunami is the result of our failings, or why a baby must suffer for other people's sins. I have never yet heard a justification for those kinds of sufferings, and a loving / just God is very hard to believe in whilst those things happen.
There are some very difficult and beautiful things that most of us feel - like love, and sorrow, and grief... something 'spiritual' in those things that seem way deeper than science. Is that a sign of a greater purpose? a God? maybe, maybe not.
Is a baby born to suffer the sign of a just God? Sorry, I can't believe in that.