Wait, wait, wait... Are you saying it's just a conscience matter with your parents, or is the policy now that it's a conscience matter? Because when I was in, giving or getting blood was practically unforgivable, and that was just 7 years ago.

Christianity:
The belief that some cosmic Jewish zombie can make you live for ever if you symbolically eat his flesh and telepathically tell him that you accept him as your master, so he can remove an evil force from your soul that is present in humanity because a rib-woman was convinced by a talking snake to eat from a magical tree.

There she lusted after her lovers, whose genitals were like those of donkeys and
whose emission was like that of horses - Ezekiel 23:20