Look sweetheart (I'm assuming your 10ish) there's nothing to be afraid of. Death is a normal process of life. If you keep worrying about death then what are you living for? I used to be scared as well. I used to stay up at nights thinking about it back when I was 7.
You don't have to think in an atheist way. Atheists believes nothing happens and they accept it. Just think you'll go to heaven.