Is Christianity continuing to grow worldwide? Is there continuing growth in Christianity around the world or has it stalled/declined?  I'm interested in worldwide stats rather than for individual countries.
The numbers appear to be inconclusive, at least according to this site.

It appears the number of Christians is growing, but in terms of percentage of population, some studies show a slight growth, while others show a slight decline.  Of course the various studies are over different time periods, so it's impossible, with the given data, to draw any conclusive results.

Wikipedia estimates the 2007 growth rate of Christianity at 1.38%, which appears to be within the range of the various studies cited above.