Yes we require a host when we visit this world to utilize all aspects of it.
We? Sounds a bit parasitic to me. I think of the human form as a type of cocoon in which a spiritual being should develop over time. It either produces a "living being" or it doesn't.
Many religious practices, secular laws, and customs are implemented specifically to abort that development, for obvious reasons, by demons, devils, and the potentates of darkness.
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