Hello!
I'm an 18-year-old Brazilian, I love studying ancient philosophy, and eventually I came to especially admire Epicureanism after seeing the unfilled holes in Stoicism (my favorite old philosophy).
I just bring some doubts and contestations about Epicurus' philosophy. We must remember that philosophy is the love and search for truth, and not an inflexible and unquestioning religion.
Considering the materialist and empiricist characteristic of Epicureanism, how did Epicurus manage to arrive at the certainty that "nothing can be created from nothing". Indeed, his argument makes sense, but has this been empirically observed to be raised as a universal and indubitable certainty?
Considering the argument that all things need a cause in order to exist, this opens up an opportunity for the existence of a creator, or creators. How did Epicurus, empirically or rationally, come to the conclusion that their interference in our lives is unlikely? How did he come to the conclusion that the gods he mentions in the letter to Meneceus are blessed and only relate to their fellow men?
Finally, notice that I didn't even touch on the subject of death! 
Sorry for the english, i used a translator.
Hugs and all the best! 