1.2 billion people are normal, aka atheists, 16% of the world's population. Everyone else is a superstitious idiot.

"What percentage of the world is atheist?"

I looked it up. Atheists are at number 3, behind Christianity & Islam, at 1.2 billion people, 16 percent of the world's population.

List of religious populations

Religion Adherents Percentage

Christianity 2.4 billion 33%
Islam 1.8 billion 24.1%
Secular/Nonreligious/Agnostic/Atheist 1.2 billion 16%
Hinduism 1.15 billion 15%
Buddhism 521 million 7%
Chinese traditional religion 394 million 5.50%
Ethnic religions excluding some in separate categories 300 million 4.19%
African traditional religions 100 million 1.40%
Sikhism 30 million 0.32%
Spiritism 15 million 0.21%
Judaism 14.5 million 0.20%
Bahá'í 7.0 million 0.10%
Jainism 4.2 million 0.06%
Shinto 4.0 million 0.06%
Cao Dai 4.0 million 0.06%
Zoroastrianism 2.6 million 0.04%
Tenrikyo 2.0 million 0.02%
Neo-Paganism 1.0 million 0.01%
Unitarian Universalism 0.8 million 0.01%
Rastafari 0.6 million 0.01%

Total 7.167 billion 100%