<< 42,000 compared with 22,000 is hardly the same as comparing 61,000 with 9. >>
It is when the categories logically belong at the same level. They're just numbers, and we don't classify things based on the number of sites for that topic. Just because Rock music has 7,500 sites and Polka has 41 doesn't mean they both don't belong in Music/Styles. Just because Christian music has far more sites than Jewish doesn't mean Christian music is under Styles when the others are under Religious, no matter what MP3.com or Amazon.com do. We don't care about popularity.
Trying to incorporate the number of sites for Christianity versus other religions, denominations, sects, etc. into your argument just won't work. We don't make popularity decisions. If it behooves a data user to to so, they can. You can get your own copy of the RDF and put Christianity wherever the heck you want to. Feature it on the front page of your site if you want. Similarly, if someone wanted to lift the "popular" artists out of bands and artists and ignore the thousands of unknown, that's their perogitive as data users, but not ours. We're no more likely to link Christianity from the top than we are to link Britney Spears from the front page.