The Problem with Atheists

  One thing I keep hearing is: "It is up to the Theist to prove God's existence".  My question is: why?  If it is the Atheist making the assertion, shouldn't it be up to the Atheist to verify the claim that God doesn't exist?  See, I don't understand this, people will say "why does a loving God allow evil"?  Well if there's no God, how can there possibly be evil?  It doesn't make sense, and it doesn't foll logic.  If you are going to use that logic, why does that same God allow good to happen?  In fact, what is good and what is evil?  If God does not exist, who makes that judgment? I've noticed that many Atheists tend to focus on the negative aspects that have happened in the name of religion (that link talks about it) https://www.youtube.com/watch?v=HBCvF5cQ8HQ, but when was the last time you saw an Atheist orphanage, an Atheist hospital, an Atheist charity whose cause wasn't promoting Atheism?  This is another thing I do not understand, if Atheists were secure in their beliefs, why are they so Evangelistic in their Atheism?  It doesn't make much sense whatsoever,  If Atheists are sure there's no God, why does it matter whether or not I believe one?  If a Christian wants someone to accept the Gospel, that's because their religion (Christianity) teaches that Christians "Go into all world and preach the gospel to the whole creation" (Mark 16:15 RSV), well, what Holy Text tells the Atheist to do something similar?  If Atheism is the lack of a religion, why do Atheists treat it like a religion?  Look, I don't have all the answers, and maybe I will never persuade a single Atheist to be a Theist, but logically speaking, if Atheists were so sure they were correct, they would not have this bitter anger towards God, it would be more believable if it were apathy, but it is bitterness, and I guess that, more than anything, is what bothers me.  Why would you be angry at a God that doesn't exist?