The following statistics show the number of adherents in all known approaches, both religious and irreligious worldwide. Christianity, Islam, Hinduism and Buddhism are the largest world religions today. Approximately 75% of humanity belongs to one of these 4 religions. Christianity is the religion with the largest number of professed religious adherents, followed by Islam. The third-largest group of approximately 1 billion people adhere to irreligious approaches which include Humanism, Atheism, Rationalism, and Agnosticism. Hinduism with 900 million adherents is the third largest religion followed by 19 smaller groups of religious adherents. These figures are necessarily approximate: note that the figures in the following table total nearly 7 billion people, yet the world population was only 6.1 billion (2005). [3].
Christianity 2.1 billion
Islam 1.3 billion
Secular/Irreligious/Agnostic/Atheist 1.1 billion
Hinduism 900 million
Chinese folk religion 394 million
Buddhism 376 million, not including Chinese folk Religion (see also Buddhism by country)
Primal indigenous ("Pagan") 300 million
African traditional and diasporic 100 million
Sikhism 23 million
Juche 19 million
Spiritism 15 million
Judaism 14 million
Bahá'í Faith 7 million
Jainism 4.2 million
Shinto 4 million (see below)
Cao Dai 4 million
Tenrikyo 2 million
Neo-Paganism 1 million
Unitarian Universalism 800,000
Rastafari movement 600,000
Scientology 500,000
Zoroastrianism 180,000 to 250,000
Everyone is wrong. You are right. That should make you happy. Goodbye.