I don't understand Christianity

- The bible is 2000 years old and has been rewritten and re-interpreted multiple times but people still take it so literally
- Jesus was around just over 2000 years ago, so did everyone before then who didn't know about this religion go straight to hell?
- What about people who don't accept jesus into their lives because they havn't heard much about Christianity or grew up in a different religion? Do they deserve an eternity in hell?
- If you are Christian, why? And are you open to other truths? Or do you believe the bible is the only truth?
Make it make sense