I'm really frightened about a Christians that came up to me...?

That is so sad...I'm sorry to hear that. I had a friend who had something like this happen. A woman all but accosted her in a parking lot and told her "You can't go to Heaven if you're not SAAAAVED!!!!" My friend got really upset (because she wouldn't let up!!!) and said "Are YOU going to Heaven?" And the woman said "Yes." And my friend said "GREAT!!! I don't want to be there then!!!!"