I think you've misplaced your argument with the use of the term "gallon of it via IV". That prejudices your answer. Acceptable use of blood is certainly discussed. Jesus sacrifice was the blood of an innocent man, used in order to save life, all life.
Is there a difference in using similar "innocent blood" (not taken unlawfully) in order to save life, albeit in a lesser way? After all, no dead person praises or loves god...