Spiritually Speaking, if a vampire bites a zombie, who becomes what?

I don't know, but if the zombie is Jewish, does it hold up a star of david for protection?

Since the vampire bit the zombie the zombie will become a zombie/vampire. If the zombie bit the vampire the vampire would become a vampire/zombie. That is if the vampire bit the zombie in such a way as to turn it, many sources relate not all vampire bites result necessarily in becoming a vampire. Some relate you need to be nearly drained but then at the point of death given vampire blood to drink by the vampire seeking to turn you into one. Others have different methodology.

There is also a chance that the vampire still becomes a vampire/zombie although it was the biter. If the zombie is caused by a transmittable disease in the zombie blood and the vampire drank it although not bitten it could still contract it from that.

The zombie becomes a zombie vampire. The transformational effect comes from the biter, not the bitee. If the zombie had bitten the vampire, the vampire would become a vampire zombie.

Both are a rather fearful thought, and now I'm scared.

Humanity would become even more screwed than we already are.

They would be ....interchangeable.......

Protestant Nazarene

god isn't real