Why does he keep trying to make me Christian?

I am in 7th grade and i have decided i dont believe in god. my freind, a catholic, keeps trying to covert me and wont stop. i have told him that i wont become a christian and i am really tired of him asking. he wont stop and one day we got into a really bad fight that broke his nose and got us suspended. i am really depressed right now because he is calling me the devil and how i will burn in hell and how i have no soul. please help i have to go see a threripist but its not helping. dont tell me to convert or that i really am evil also.