To stand up for Byennie a bit here, as someone who has sold online advertising in the past, Google ads works via a "bidding" system, so the ads that are shown are those of the people/companies who are willing to pay the most per ad.
Additionally, while I think you can ban individual causes/companies from advertising on an as-needed basis, I don't think there is a way to broadly ban one form of content besides banning it once you see it (because these impressions are only a few dollars per thousand impressions, max, so Google, unlike facebook, does not have a "team" to monitor or classify the content of ads).
So this is not the agenda of CB mods or anything else, and I think the changing ads suggest that Byennie is trying to be proactive by banning overtly political/religious ads as they sees them.
EDIT: Okay, I just noticed my post had hyperlinks to advertisements automatically added to it. THAT seems a bit over the top.