What is the fastest growing religion?

Short answer: Christianity Slightly longer answer: Christianity is the fastest growing religion in absolute growth, meaning the fastest growing religion in the annual increase of new adherents. The absolute growth number is calculated as the annual number of new Christian converts subtracted the number of ex-Christians + number of births subtracted number of deaths (new converts - former Christians + births - deaths). Christianity is the fastest growing religion at both parameters, both in absolute number of new converts and absolute number of new Christians due to population growth. In all, this sums up to an additional approximately 25.2 million new Christians annually(Table J). 22.7 million due to population growth and 2.5 million due to conversions(Table J). Another slightly longer answer: Another way to calculate growth is in relative terms. How much does a particular religion grow (or shrink) compared to last year. Since relative growth favours smaller base numbers, in terms of ...  more

By number of new adherents Christianity is the fastest growing religion in the world with 30,360,000 new adherents annually (from 2000-2005). This is followed by Islam with 23,000,000 new adherents annually and Hinduism at 13,000,000.  more