These are the current world estimates per Wikipedia. Highest to lowest. - Results (99 votes)
Christianity
23.23% (23 votes)
23
Secular/Nonreligious/Agnostic/Atheist (not religions, I know)
46.46% (46 votes)
46
Hinduism
4.04% (4 votes)
4
Chinese traditional religion
1.01% (1 vote)
1
Ethnic religions excluding some in separate categories (???)
2.02% (2 votes)
2
African traditional religions
4.04% (4 votes)
4
Sikhism
6.06% (6 votes)
6
Spiritism
4.04% (4 votes)
4
Judaism
3.03% (3 votes)
3