Yes. Being an atheist or agnostic doesn't mean someone is an evildoer out to get everyone.
No there is not— not if you believes what the Bible says.
If you don’t believe the Bible, than the answer would be yes.
I believe, therefore, my answer is no.
Perhaps ... but without God, "good" is no longer an objective thing; it requires human definition and is therefore a malleable thing. Morality becomes relative.
The author never wrote that.
Certainly not intentionally. However, an atheist consciously rejects the very source of goodness and morality. Like cut flowers that soon wither and die without roots, atheists also have no roots for any morals they may hold, and they vanish under stress.
Perhaps incidentally, but the moment they substitute their own judgement in the matter of good and bad for God's and or act upon it they become ‘evil doer's’ by literal definition. (Your “out to get everyone” stipulation has nothing to do with anything).