I offended my girlfriend's Christian parents. How do I fix this?

First off NO you dont have a chance, I am sorry to say. You have to accept the fact that Erika does not want to see you again and with good reason, and please dont try and contact her poor parents again either. You need to get some self esteem and sort out your life, for starters do something about your dress sense, get a job, move out of home and grow up. I am sorry, I am not trying to be hurtful to you but you turned up at Erika's house looking and acting like a 13 yr old and expected to be taken seriously. Good Luck with Your Future.