People only know if you're Christian if you are open about it, myself am only young and i go to a Christian school so it's obvious that i am, however, last year i attended a public school, but i got teased so bad that i had to leave, because i was so open about my faith, never be ashamed in what you believe in, at the end of the day, God gives you what's right, it might not see it at first but it's all good, God is good, always be open in schools in what you believe, you could change someones life.
i think thats irrelivent to the question but thats what God put on my heart to write so i did