I think this depends on what the ads are being used for. Majority of ads I see are for church services, or long rants on a particular religious topic by individ

I think this depends on what the ads are being used for. Majority of ads I see are for church services, or long rants on a particular religious topic by individuals who aren't selling anything. Most of my religious ads are not part of a big marketing campaign. Centrist or progressive churches would also benefit from telling people what time services start. And some progressive Christians would want their opinion piece or podcast promoted. I'm sure those ads exist. I just don't see them very often. For ads of this type, we're not talking about expensive bids. These fall squarely into the "$20 to promote this post" category.