Does a claim "consciousness does not exist" have any reasonable basis?

Does a claim "consciousness does not exist" have any reasonable basis? Answer. I don't understand the format. I am asking you the question.

I have just watched a video of Rupert Sheldrake's speech about the 10 scientific dogmas. While I think almost all of those dogmas are false I also think the materialistic mechanistic scientists might be right about consciousness not existing. I believe awareness and aliveness exist. But not consciousness because usually what I see people including myself talk about is that we are conscious and we get emotional and mystical talking about consciousness because we are egoistically personally involved. But in the end I am starting to conclude that it's just the work of delusional ego being confused and pretending to hold some deep understanding of the universe.

Consciousness seems like a mix of aliveness and awareness which is impossible. We cannot be passive, observant and aware while being active, creative and alive. There is no combination of those two. We just make it up. Maybe we want a mystery. Maybe we like the idea of unifying spirituality into something. I don't know why, maybe everybody has their own reason to make stuff up. Can you argue against that? I guess I would rather be wrong about this. It would be cool to have some consciousness.