Lets be frank there is money in the church and the money is brought by the worshipers. To some running a church is like running a business and like bussinesses the church must grow. To grow this their bussiness(church) they need a lot of worshipers hence the churches. Also Nigerians are very vunerable and this makes them solution seekers and they believe that they can find solutions in the 'right church' and once they dont find their solutions in a church they seek it in another 'right church'. So the churches will keep on increasing as long as people keep on seeking solutions in the 'right churches' and as long as the 'church owners' see church as a bussiness and not as a way to salvation.