[aatd86]

Isolation tank would not work because living organisms have memories (store data).

You would have to be born with no data and no way to acquire any (no perception).

Would you then be conscious?

Matter is just data of a particular kind as in anything.

The only thing that one is really sure of is existence. Note that non-existence doesn't even exist by definition.

If we want to get into theology, I would even claim that existence is the true unique thing that encompasses everything and all possibilities (some will never manifest physically). Call that God, the One (Allah) etc...

That could make sense. Most of everything else is folklore imho.