Given that most Christians live in the western, civilized world and subsist mostly on high calorie, high fat diets, they are very large. Much of the rest of the world, for example Hindis, live on low calorie diets and are quite small. So Christians are on average 20% larger than those of most other world religions.
ANSWER 2:
There are more Christians on earth than any other religion (2.1 billion), with Islam second at 1.5 billion.
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