I'm not that familiar with Haught, so I won't say anything.
For the other three, I'd probably focus on the idea of science and whether it has made religion, and specifically religion involving a God who interacts with the world, impossible to really take seriously. Sagan, so far as I know (I'm not SUPER familiar) viewed religion as something the ancients invented to explain things that we can now explain other ways. Thus, it was his opinion it is outdated as a worldview since we now can know things more surely through science, empiricism, etc.
Dawkins is a little hard to pin down (he's all over the place), but since you want a "story arc" as it were, I'd go for his views on similar issues -- "Darwin made it possible to be an intellectually fulfilled atheist," etc., and how science has obviated religion (see his most recent book, for kids, e.g.) and left no place for God.
Polkinghorne is most interested in how one can, indeed take both science and Christianity seriously, and how modern science leaves room for an interactive God (and reason to believe in him). In Pokinghorne's view, science is undetermined sufficiently to allow God to interact with and guide the universe, and he does not see the progress of scientific knowledge as obviating God, but merely teaching us more about Him.
C.S. Lewis also wrote some interesting things on this stuff ("Dogma and the Universe," e.g.).
Good luck.
Culture and Imperialism-3
(roughly), passworded invitational.
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