Be strong and take it. Remember that at times of Prophet, people were tortured for being Muslim, not just insulted. Till this day it happens, in Burma and other places. Also remember that this is a test from Allah and that He will reward you if be patient.
If you weren't Muslim they will still find something to bully you about. It is just how bullies are.
My advice, ignore them and do not show that it affects you in any way even if it does. Soon it will die out. Just focus on your studies, your life, your religion, your hobbies etc. Make sure you learn good character because that is the best way to show them what Islam is about, with good character not words.
And do not forget to make Duaa
Always say,
"اللهم اكفنيهم بما شئت"
It is a Dua to be recited when you are afraid of people's harm/attack.
Recite: Allahummak-fineehim bima shi/ta.
Translation:
O Allah, protect me from them with
what You choose (or as You will)