What do scientists say about existence?

[Little Rik]

The farthest we've gone so far is back to the Big Bang and down to QM particles; these represent the current limits of our observation...........

Correct as far as physical science is concern.

and asking a scientist to speculate beyond that is to ask him not to do science.

Wrong.
Science doesn't have to be only physical science Ben.
We humans are not only made of flesh.
What about mind and consciousness?
As the whole essence of creation is also made of something else other than the physical aspect also science can and will go behind the physical aspect and when she will do this a lot of surprises are there for the ignorant masses.