A similar search for "celebrities who converted to Christianity" doesn't bring up all that spam or promotionalism or whatever you want to call it. You're free to create a video or tag to attach to every YouTube video featuring a celebrity who became a Christian if you want, and it would change the results of searches.
The exact quote search may be amusing to you or indicative of just how much somebody is promoting the idea of celebs becoming Muslims, but it doesn't really make for a fair comparison. Search without the quotes and you find videos of celebrities (mostly in India and other non-Western countries) who converted to Christianity.
Well, regardless what you think about the use of an exact phrase search for doing any comparisons, I did specify that I was using that method in my original post, and my reported results were accurate (not “BOGUS BOGUS BOGUS” and you wrote in your reply, where you provided the result count that was done without using the exact phrases).
Also, go take a more detailed look at the results from using - celebrities who converted to Christianity - without using quotes to make it an exact phrase. You will see that many of the videos included in those results are actually about celebrities who converted FROM Christianity TO Islam, and again, all those results get included because they have all your search terms, but not in the order that was intended for getting an more accurate measure on what you were trying to get at.