More poignant for us, at Laetoli in Tanzania are the companionable footprints of three real hominids, probably Australopithecus afarensis, walking together 3.6 million years ago in what was then fresh volcanic ash. Who does not wonder what these individuals were to each other, whether they held hands or even talked, and what forgotten errand they shared in a Pliocene dawn?

The Universe does not owe us meaning.

In our prehistoric past, we would have lived in extended families, surrounded by kin whose interests we might have wanted to promote because they shared our genes. Now we live in big cities. We are not among kin nor people who will ever reciprocate our good deeds. It doesn't matter. Just as people engaged in sex with contraception are not aware of being motivated by a drive to have babies, it doesn't cross our mind that the reason for do-gooding is based in the fact that our primitive ancestors lived in small groups.

It is time to stop the mealy-mouthed euphemisms: 'Nationalists', 'Loyalists', 'Communities', 'Ethnic Groups', 'Cultures', 'Civilizations'. Religions is the word you need. Religions is the word you are struggling hypocritially to avoid.

If we are too friendly to nice, decent bishops, we run the risk of buying into the fiction that there's something virtuous about believing things because of faith rather than because of evidence. We run the risk of betraying scientific enlightenment.

Certainly science should continue to see whether we can find evidence for multiverses that might explain why our own universe seems to be so finely tuned.

I am an enthusiastic Darwinian, but I think Darwinism is too big a theory to be confined to the narrow context of the gene.