What about the point that if scientific evidence was found, it would
no longer be supernatural, so we could still say we were right all
along.

How can we know that there is no supernatural if we change our
definition of what is supernatural as time goes on.

Is that a case of moving the goalposts?

BTW, the Brights are trying to become a serious movement. The
website for those that have not found it is www.the-brights.net .