We study different religious faiths in order to understand other people. Many people have strong religious convictions, and it would be impossible to understand them without first understanding their beliefs.
Judaism, Christianity, and Islam are monotheistic faiths practiced by about half of the world’s population. Monotheism refers to the belief in one God. The faiths are often called western religions to distinguish them from the eastern religions practiced primarily in Asia. Believers in Judaism, Christianity, and Islam are found on every populated continent, but tend to be concentrated in North and South America, Europe, Australia, Western Asia and North Africa. Christianity and Islam are growing influences in sub-Saharan Africa, often replacing indigenous faiths.