Big J sent his son Little J to earth as a 'human' sacrifice. The fact that Little J was allegegdly about 30 years of age when the deed was done shouldn't take away from the my concept of Christianity being based on child sacrifice.
Imagine the hullabaloo if Jesus had been 7 years of age when he was nailed up.
There is a precedent of course for the whole 'I need a sacrificial child' thing