The official Second Life website describes the showcase as:
(Source: SL Showcase FAQ)
The Showcase section of SecondLife.com and the Second Life viewer highlights some of the best inworld locations and Resident creations. For new and existing Residents alike, this is the place to go to explore and discover what's most exciting in the Second Life world. Showcase features Arts & Culture, Education & Nonprofit, Fashion, Hot Spots, Music, Photos & Machinima, and Tutorials.
Venues and content featured in Showcase are not paid placements.
Visit Koinonia Website:
Visit the Koinonia Church Website
To visit their church in Second Life click the SLURL below:
Visit the Koinonia Church in Second Life
Here are more pictures of the church right after its completion. The current church looks a little different on the inside as I had to dismantle some of the ceiling due to the subsequent prim shortages of the client.
Visit the Flickr Photo Set