So, merely because something exists all around us, we need not intellectually or even consciously KNOW that it is there ...even though we may be experiencing it every day.
Yes, but that isn't a reason for anybody to take your hand-waving and baseless assertions seriously. There needs to be some solid, objective reason to do so. Even then it would only be a conjecture unless you could propose something with enough detail that it could, at least in principle, be (objectively) tested.
Then you would have a hypothesis.
Or alternatively, if you want, you can study spirituality, undertake spiritual practice and introspection over a few years. You'll get your evidence.
How it feels to you, or anybody else, when you "study spirituality, undertake spiritual practice and introspection over a few years" isn't evidence of anything other than how it feels like to people who study spirituality, spiritual practice and introspection over a few years.
Take Sam Harris - who has spent many years learning about spirituality (he mentions Buddhism and Advaita Vedanta) introspection and mediation practices (see his book
Waking Up) who maintains that while it does provide benefits and insights into how consciousness works internally (I'm reserving judgement as I haven't finished reading the book yet), but flatly rejects any claim that it tells us anything about consciousness outside the body or any other claims about wider reality.