(The following - including the St Augustine quotation - is on the BBC Website homepage today... I found it interesting, and thought you might too.)
The Christian congregation in Africa has grown by more than 4,300% since 1900 - a rate of expansion unknown since the earliest years of the Church. There are about 390 million practising Christians in Africa today, more than three times as many as in 1970. Over the next 20 years, this figure is expected to grow by a further 200 million.
The good Christian should beware the mathematician and all those who make empty prophecies. The danger already exists that the mathematicians have made a covenant with the devil to darken the spirit and to confine man in the bonds of hell. ST AUGUSTINE (354-430)