I am an atheist, but I think there are several possible answers to the problem of evil: free will, as a consequence for "sin," as a judgement grounds for the overwhelmingly corrective afterlife, etc. There's a whole section on the Wikipedia page: http://en.wikipedia.org/wiki/Problem_of_evil#Answers_and_Defenses
I'm not saying that, ergo, God is real, but there are some serious holes in the problem of evil. Honestly, because it's difficult to disprove a being whose memetic existence has evolved to be difficult to disprove. Best of luck.