Earlier this month the Pew Research Centre released data from its Global Religious Futures project, which forecasts the changing size of eight major religions over the next half century.
The study is based on demographic factors in 198 countries including fertility, age and life expectancy.
Here's what we learned:
1. By 2050 there will still be more Christians than any other religious group
The global Christian population will remain stable over the next 35 years, despite Muslims being the fastest-growing religious group. Islam is forecast to be the world's largest religion by 2070, if current trends continue.
2. More and more Christians will be living in sub-Saharan Africa