“For all intents and purposes the Earth IS considered a closed system.”
I’m a creationist, but this is simply not true. The earth constantly receives energy from the sun, so it cannot be considered a closed system, anymore than a cupcake inside an oven can be considered a closed system.
Only if our planet were floating in deep space far from any external source of energy would it be feasible to consider it to be a closed system.
From your argument I can only conclude you have read loads of evolutionary ‘science’ while studying little if any scientific laws and how they came to be referred to as laws rather than mere theories.
The 4 Theromodynamic Laws have been shown to be true and verifiable due to copious amounts of scientific experimentation. Call it an isolated system if you have a problem with closed but either way the Earth and Sun are and will continue to both completely devolve rather than the Sun turning our Earth into a more highly ordered planet.
Heck, even mankind [applying intelligent work] is doing more to aid devolution rather than evolution of our planet.