Is consciousness just an illusion?

Sorry, cupcake, that isn't how things work. When you make an incredible, incoherent claim, the burden of proof is upon YOU to back it up. You don't even know what "eternal conscious awareness" means. It's just a slogan you picked up.

Here, let me hold your hand.

One way to articulate what you mean by a concept or property would be to imagine how the world would be noticeably different if the universe lacked that property versus if it had that property. So please: describe how we could tell if "eternal conscious awareness" existed versus if it didn't.

Good luck with that!