AB,
But we have the other extreme of assuming that anything which can't be understood by human endeavours does not exist - such as free will, souls, God ...
...leprechauns, the Loch Ness Monster, unicorns, Jack Frost, the invisible pixies that hold stuff down with tiny strings so it doesn't fly off into space, monsters under the bed,
and Father Christmas. And indeed anything else that may happen to pop into anyone's head - or indeed hasn't popped into someone's head but may exist nonetheless.
That's your problem here - you just assume the premise (that there actually is a suite of particular "anythings" that happen to suit you but that can't be understood by "human endeavours") and then accuse others of thinking they doesn't exist. What people actually think though is that there's no reason to think that any of these things
do exist, which is a very different matter. If ever you managed a cogent definition of "souls" for example and demonstrated their existence, then most people would accept their existence. As presumably would you if I managed the same thing for, say, unicorns.
As it stands though, just making logically very bad arguments doesn't help you one jot in that effort.
Indeed, there is prof Dennet in Gonnagle's link who tries to show that consciousness itself must be an illusion because it can't be defined in particle physics.
You misunderstand him - rather he says that consciousness as a separate "thing" is illusory but, even if you didn't, that would help you not one jot either.
Incidentally, you do know that DD is one of the more public of the so-called "new" atheists don't you?