Out with organs, choirs, wooden pews, and quiet services --- and in with full bands, big screen TVs, stadium seats, light shows, high-energy preachers, and streaming video. This is the age of the “mega-church”.

While traditional churches are losing members left right and centre, mega-churches – as they’re being called – are growing around the world.

The definition of a mega-church is any Christian church with a congregation of more than 2,000, but they're often a lot bigger –Faith Tabernacle in Nigeria can hold 50,000 people at a time.

Mega-churches offer a whole new way of worshiping. "The plasma screen TVs have replaced crosses, Power Point-like presentations of the words of songs and liturgical practices have replaced the hymnals," one professor told CNN.

In London, a report on the rise of megachurches showed that church attendance is now on the up, despite decline in traditional churchgoers. There are now a number of churches in the city with congregations of around 2,000. Two, Kingsway International Christian Centre and Ruach, have 5,000 people each weekend.