What Is God's "Holy Spirit"?

Why refer to God's power as hagion pneuma (holy spirit, aka holy wind, or better yet holy breath)? Think back to Jehovah's first creative act toward mankind. After forming the body, he (God) blew into his (Adam's) nostrils the breath of life. -Genesis 2:7.  What better way to remember our creator & commemorate our becoming living beings than by that first holy life-giving pneuma (breath, wind, air)? By it we are thus reminded that our very life is dependent on that first breath? That power to create life from inanimate material is still exclusively Jehovah's. (Reference 1, Reference 2, Reference 3)