Also, just because some scientists can't define consciousness is no reason to posit that it could survive the brain whence it arises. There is absolutely no earthly reason to think that could be possible. Now, to wish it, sure. But to believe it? Nah.

Anyone who would suggest that that was a valid reason would be brain-lame. There are OTHER data, though that suggest it far more strongly. Excluding such data from your thinking is also a form of bias. Such data include the large collection of reports concerning experiential OBE, NDEs, and recovered memories from previous existences which cannot be readily explained away by other means.

This is not to say such things will become subjectively apparent to someone just because they study the reports. The number of variables that make up an individual's scope of view is huge, more than I would care to go into here.

But as far as reasoning with avbailable data, it deserves looking into as to how extensive suvh reports are and what they cover.

A starting point, for example.

And another.