What makes something sacred? What makes something profane? When does something switch over from being profane to sacred? Does it every fall back to profane again? I don't know if there is a good answer to all of this, but here are some of my thoughts.
There is a thin line between something being profane, or secular non-sacred, and being sacred or holy. This line is intent or motivation. My understanding is that there is no separation between creation and created except through the separations we created. I believe that God truly is all in all. God is in everything and everything is in God. Except that we sometimes intentionally push God out of things or reject God's existence in the world. We have the choice of how deeply we want to engage God in the world.
This means that everything has the potential of being sacred or holy because God is there in everything. Calling everything into a deeper existence in God. Anything you do, say, or places and things (nouns?) can be sacred or holy. The potential for holiness is incredibly high because God is present to us. Christ promises this at the end of Matthew's Gospel when he says, "And surely I am with you always, to the very end of the age" (Matt. 28:20 NIV). Christ through his spirit is always present and always active around and in you, thus how can anything be anything other than sacred?
Although God is always present to the edges of the universe. We choose how much we are present to God in the world. We choose whether we can see the world as being filled with God, or if we are going to see the world as being void of Christ's presence. We are meant to offer up all of the world to God and see God's presence in the world thus communioning with God through God's creation. Instead, we exploit creation. Instead, we push God out of the way and view the world as something entirely other and lesser than God. So if our actions in the world are strictly about survival and not about bringing life than I would say those actions are profane. If our goals is not about connecting with God then we are probably profaning the world, which leads to death and destruction.
Our attention needs to be on God and God's presence in the world. Then our actions, our words, our nouns need to be focused on delving deeper into the presence of God in the world. This means that eating can be a holy act when done as a way to consume God's presence in your life. Sex, conversations, dancing, playing, listening, etc. can all be done as a way to make these acts sacred, but can also be a way to profane these acts. It's all about the why. Why are you doing this? To bring about communion with God or for selfish/"worldly" reasons. We can misuse anything making it profane and ungodly, but we can also use almost anything as way to offer blessings back to God.
Quick word about God's otherness and God's presence in the world. Just because God is present to us in creation does not mean that God does not transcend creation. I especially think of verse that say my ways are not your ways (Isaiah 55:8 for example). We cannot understand the mind of God. We cannot approach God in terms of knowing what creation holds for us. We cannot fathom God completely. God transcends our understanding, but we can know God as well as we can as created beings through Christ and through creation. God is available to us, but not to the extent that we can fully grasp God.
Peace,
Mark