Nothing but "best guesses" can be provided on this subject: About 33.3 percent are Christians, 21 percent are Muslims, 13.3 percent are Hindus, six per percent are Buddhists, 12.5 percent any number of other religions, 11.5 percent are non religious and the balance are atheists.
I believe that around 86% of the world's population is religious. 6 billion.
Secular means not specifically relating to religion or to a religious body. If you mean, what percentage of people are not-religious (ie agnostic or atheistic) then according to the Encyclopedia Britannica around 15% of the world population (or around 1 billion people) describe themselves as non-religious or atheist.
There are about 14 million Jews in the world, perhaps 10% of them are religious. 14 million is about 0.2% of the world's population.
By statistics regarding the percentage of the overall population who respond to surveys with an answer deemed "religious".
Here's the website you need--Major Religions of the World Ranked by Size--http://www.adherents.com/Religions_By_Adherents.html.
There are as many religious leaders in the world as there are religions.
Most Czech's are atheistic. It is the most atheistic country in the world, with over 60% of the population declaring no religious affiliation.
The biological techniques that can be used to slow world population growth include the various forms of birth control for both men and women. The sociological techniques include by law (as in China) or by religious declaration.
Although asked in a religious category, this question appears to require a non-religious answer. Around six thousand years ago, the population of the world was about 85 million.
India from the Britiash India believe in Hindu. They are also one of the world's largest Muslim population.
The world's biggest religious structure is the Angkor Wat in Cambodia.
Religious people? About 6 billion.