This is good thing because... ? Your post surely seems to express some measure of happiness to find that their "success" is short-lived.
Yes, I have a problem with evangelical "conversions," because they're based solely on emotion. Once that runs out--which it invariably will--there's not much left.
The Muslims apparently have stolen into the vacuum.
That said, it should be noted that we're talking about relatively trivial numbers here. I don't know if this is a trend or not, but I find it fascinating from a sociological point of view.