Visualizer Chris Harrison feeds the names of people and places in the bible (i.e. the collections of canonical religious writings of Judaism and of Christianity) to make these cross-referenced networks. This is a close-up, you can see the full visualization beneath the fold:

Click to see the medium-sized version (1.4 MB):

Harrison says:

I set out to derive a new data set from the Bible, one that would capture relationships between people and places – essentially a biblical social network. The first thing I had to do was build a list of biblical names – Wikipedia already had a comprehensive one (2619 names!). Using this list, I parsed the text of the King James Bible. When two names occurred in the same verse, a connection between those two entities was created. To make this information visually meaningful, I ran the network of connections through my WikiViz engine, which caused highly connected groups of entities to coalesce. I through it would be fitting to render the visualization using an “old world” color scheme.

He also has a number of other biblical visualization in his collection of Web pages hosted on the Internet.