Eru Ilúvatar
Eru Ilúvatar is the god of Tolkien's middle world. Eru's power is enough for everything. Eru first created the Ainur folk. And Eru wanted the Ainur folk to shape the world. With the music, the Ainur folk shaped the world, and Eru created the Elves and the People. And after the Earth was formed, Eru awakened the People and the Elves. Eru commissioned the Ainur folk to teach science the People and the Elves. He also allowed them to speak in some plants and animals.
It's wonderful how the world that the created fits perfectly with what he wanted to achieve: a mythology for Britain and yet as Eru is God, it also works perfectly with his Catholic beliefs.