Redemption Camp has 5,000 houses, roads, rubbish collection, police, supermarkets, banks, a fun fair, a post office – even a 25 megawatt power plant. In Nigeria, the line between church and city is rapidly vanishing. [...] Hallelujah is the theme for this year’s Holy Ghost convention at one of Nigeria’s biggest megachurches, and all week the word echoes among the millions of people attending.