Many religions are reflected in Children's literature, see below for some examples of the world's largest religions.
Islam (1.3 billion people worldwide)
Christianity (2.1 billion people worldwide)
Nonreligious (Secular/Agnostic/Atheist) (1.1 billion)
Hinduism (900 million people worldwide)
Chinese traditional religion (394 million)
Buddhism (376 million people worldwide)
African traditional and Diasporic (100 million)
Judaism (14 million people worldwide)