What are his arguments - against materialism? It seems to have something to do with the afterlife:

"This may be a distortion of the time in which we fortuitously find ourselves; what was rare in the last four thousand million years of evolutionary history might be common in the next four thousand million years. Weak support for this argument might come from the most closely related species to us, the Neandertals. Perhaps independently they developed some sort of sense of an afterlife, at least to judge from their practice of deliberate burial. Materialists will scoff at this as a shared delusion, but there are metaphysical alternatives that are perhaps more fruitful."

• The Crucible of Creation, p. 6.