What? explain this please?

ok im buddhist and there is this very strict christian on my bus (im 14 and live in PA) and yes i know A LOT about other religions so dont tel me i dont know. ok well i was talking to her about being buddhist and she was like "youre going to hell, meditating is a sin, not following god is a sin. and blablabla" any way please explain how the f any of that is a so called sin. i mean really, if any of the stuff in the bible wasnt just made up to explain things like the ancient greeks did. then explain science. and also they are said to have found jesus's bones which means he didnt really rise from the dead. and also (sorry im ranting here) but if this religion was real then why would "god" make his people murder other people in his name or just because they dont follow him? can someone explain