Can you lower

[Jackalope]

I use google for a lot of searches as the forum post search is a bit wonky.

You can limit it to forum results using the "-site:atheistforums.org" modifier. The only drawback is that it takes a few days for things to show up there. A number of sites use a filtered google result as a search option. Perhaps a sitewide google search could be added to the forum somewhere.

I don't think google has access to the whole database do they? I would imagine (read: hope) that the google search is just a web spider?

Correct. Google only indexes publicly visible content.