<<If you'll read the original, you'll find that Brian Harper had
made an assertion that faith without resurrection was
worthless. The example of the Sadducees shows that this need
not be true. The relevance is with respect to Harper's
assertion.>>
I don't mean to speak for Brian, but in context it seems to me he was not
talking about faith in general, but about the faith of the CHRISTIANS. Without
the resurrection, this new faith was indeed worthless. The example of the
Sadducees is thus, IMO, irrelevant. They were not followers of a
self-described Messiah.