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Lain isn't a god, she's an android developed by Tachibana Labs, with capabilities much higher than expected. Her job was to track down members of the KNIGHTS (which she did) to ensure corporate superiority over the wired. The one trying to become a god was Tachibana himself by developing an Internet Protocol which would allow the wired and the real world to unite (which would in turn, bring the dead back to life since reality would no longer be an issue) but he failed because Lain got confused (probably thanks to Arisu) and since she was connected to pretty much everything there was to, she did what every techy does with a broken computer. Format, use the last working settings. Reboot.
This explanation is simple and probably inaccurate, but SEL is a wonderful philosophical piece of art that is being constantly ruined; if you want cute hackers, search for "cute hackers" like Alice from God's Memo. Or something. Stop being so pedantic and read a little.
IMG - Last lines of code from Lain's PSX game translation. It's a good keepsake I imagine.