What's in a meme? It is a Neo-Darwinian concept that is supposed to explain some of the things we have been talking about in terms of survival and morality and God.
Oxford Prof. Alister McGrath gave a lecture on this, The Spell of the Meme (here is the PDF).
He also has a book length critique of Dawkins concept as well...
Dawkins' GOD: Genes, Memes, and the Meaning of Life
(Review) "Wielding evolutionary arguments and carefully chosen metaphors like sharp swords, Richard Dawkins has emerged over three decades as this generation's most aggressive promoter of atheism. In his view, science, and science alone, provides the only rock worth standing on. In this remarkable book, Alister McGrath challenges Dawkins on the very ground he holds most sacred - rational argument - and McGrath disarms the master. It becomes readily apparent that Dawkins has aimed his attack at a naive version of faith that most serious believers would not recognize. After reading this carefully constructed and eloquently written book, Dawkins' choice of atheism emerges as the most irrational of the available choices about God's existence."--Francis Collins, Director of the Human Genome Project