Ex Nihilo Creation” is a foundational theological principle. Big words for a simple idea: God spoke the Universe into existence from nothing. This is the basic truth upon which many other Christian truths are based. So please get this right.
Seems irrelevant, but if you believe that God made the Universe from His own body, you fall into Pantheism. Pantheism means that God made everything from Himself, so everyone and everything is god.
So, when some people say they see god in the trees and natural beauty of Earth, they actually mean it’s all god to them. That’s Gaia, the belief that Mother Earth is a demi god .
So, Christians should know that God spoke Creation into existence from nothing, a vitally important concept for Christians to understand.