John is a proponent of young Earth creationism.

Young-Earth creationism is a belief that the Earth is only a few thousand years old.

John is a proponent of young earth creationism.

John is a proponent of old earth creationism.

John is a proponent of old-earth creationism.

Old Earth creationists believe that the Earth is billions of years old.

John is an Old Earth creationist.

John is a proponent of old Earth creationism.

She is a down to earth person.

On God's green earth, I have never seen such a beautiful sunset.