Who is Wigan Ludgate, the Wig from Count Zero and what is their importance?

Wig is a former cowboy who became obsessed with the idea that God lives in cyberspace. Wig began tuning in to empty parts of cyberspace to find God. He went into orbit to live in space and be closer to God. When Marly meets Wig, he is living on an abandoned Tessier-Ashpool mainframe core, where the central computers of the Tessier-Ashpool corporation once resided. Wig lives alone and becomes absorbed in his insanity, but he has a companion in the artificial intelligence that inhabits the mainframe computer.