According to the World Christian Encyclopedia, about 17m Africans described themselves as born-again Christians in 1970. Today the figure has soared to more than 400m, which accounts for over a third of Africa’s population.
And as in Nigeria on the other side of the continent, they are now having a noticeable effect on public-policy debates in east Africa. Regardless of the outcome of the vote on the constitution in Kenya, for example, their interventions are likely to make abortion a defining political issue in the country.
Similarly, the efforts of new churches in neighbouring Uganda have made political controversies out of homosexuality and the right of Muslims to convert to Christianity.