Answer:
When I'm metal or wood, I help you get home. When I'm flesh and I'm blood. In the darkness I roam.
What grows up while growing down?
Known for their natural tuxedos and marching.
Though desert men once called me God, today men call me mad. For I wag my tail when I am angry. And growl when I am glad.
Known as a great deceiver, It is evil's incarnation, Once used for veneration, The root of all procreation. All you can do is shiver, When it begins to slither.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?