Define
Before I even try to answer the question in this challenge let me ask a question: what do we define as evil or good? How do we define evil and good? You must have those set in concrete before you can even think about trying to answer the question above.
My definition of evil is anything that isn't done with pure intentions. For example, you might do something that is a "good deed" to someone, but if you do it with selfish intentions (i.e. to make yourself look good, or because you're expecting something back in return, or because it's what's expected of you but really you don't want to do it) well then what does that make you? Good or evil?
I think there's a short period of almost innocence when a child is born, but after that it quickly becomes selfish, greedy, and maybe even angry. And also if mankind was born innocent wouldn't it - in theory - be possible for him to regain his innocence?
And for my answer as to whether man is born evil or good, look at the world and what it's like. And you sit there and see all the evil, wrong, and seemingly good (but secretly done with the wrong intentions) and then you make up your mind.