CSC fellow Jonathan Wells wrote a short response taking a Nature letter writer to task for spreading the old flat-earth BS knee deep.

The spherical shape of the Earth was known to the ancient Greeks, who even made some pretty good estimates of its circumference. Christian theologians likewise knew that the Earth was a sphere. The only two Christian writers who seem to have advocated a flat Earth were a 4th-century heretic, Lactantius, and an obscure 6th-century eccentric, Cosmas Indicopleustes.

And he makes a couple of suggestions of how to keep your feet clean in those Darwinian pastures.

For an objective and very readable account of the Flat Earth Myth, see Jeffrey Burton Russell, Inventing the Flat Earth (Praeger, 1991).