From the point of view of the reader, we’re made aware (via The Silmarillion mostly) about the different powers in Middle-earth and the creation of Arda. For the reader there’s Eru, the Valar and the Maiar.
The Quenya names seem to imply that Elves are aware of their existence and their role to some extend but my question is:
To what extend is each of the races aware of the existence and meaning of the different deities and specially Ilúvatar. Do the Elves recognise and know him as all powerful, omniscient creator of the world? Are Men or Hobbits even aware of his existence? What about Valar? Is there any worshipping going on?