The perfect scripture for the vampire junk would be this.
John 6 Authorized (King James) Version (AKJV)
53 Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you. 54 Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.
You can tell them that the Bible teaches that they must drink the blood of Christ to be saved.