The Fastest Growing Religion

By percentage growth the fastest growing religions in the world are the smaller religions. This is because with a smaller sample size, every additional adherent accounts for a higher percentage increase.

Therefore, by percentage growth we are uncertain what the fastest growing religions in the world are. However, logically speaking with statistics in mind by percentage growth the larger religions including Christianity (2.2 Billion Adherents), Islam (1.3 Billion) and Hinduism (900 million) are the least likely to be the fastest by percentage growth. An example to illustrate this point is Deism in the United States of America. Although in the period of 1990-2000 it experienced a growth rate of 717% the amount of new followers was very small and the large percentage increase is attributed to a smaller sample size.

The alternative measure for fastest growing religion in the world is growth by the number of new adherents. That is, the religion to gain more new believers each period would be the fastest growing religion.

As it stands the fastest growing religion by this measure is Christianity. Using the most up to date figures we determine that on average in 2007 Christianity gained 7-8million more adherents than any other religion (i.e. Islam, followed by Hinduism at 17million less).

In conclusion, the fastest growing religion by percentage growth is unknown as smaller religions are not usually account for. By number of new adherents per period Christianity is the fastest growing religion.
A side note, any argument that a religion is true because it is the largest or fastest growing is a logical fallacy. The amount of adherents or growth rate does not imply validity.