More than likely it is simply an oddity of history, but roughly every five hundred years a new major religion appears.  The newcomers sometimes grow into a serious concern for conservatives in the older traditions, but at other times they are simply ignored until the two (or more) come into inevitable contact.  Peering far back into history, the roots of the earliest religions of lasting durability are sometimes lost.  For a very rough starting point, we can consider Hinduism.  With roots going back to about 1500 BCE in the “Pre-Classical” era of the religion, Hinduism developed independently of the monotheistic traditions that would appear in the western half of Asia.  Although some would credit Judaism with equal (or even greater) antiquity, we get an idea that some of the basic thought that would coalesce into Judaism seems to have, very roughly, begun around 1000 BCE.  About five centuries later, Buddhism appeared.  At the turn of the era, Christianity had emerged from Judaism.  About five centuries later, Islam appeared.  Countless other religions, of course, existed concurrently with these early exemplars, but each of these has grown into a major world religion. 

Around about 1000 of the Common Era, Christianity began to fragment.  The first major, official split was between Orthodoxy and Catholicism. Christianity’s penchant for fragmentation would eventually lead to Protestantism—a religious form quite distinct in many ways from traditional Christianity—and that happened roughly five centuries later.  The most obvious split took place around 1500 with the Reformation, but it was also around that time that Sikhism appeared.  The new religions of the common era often involve irreconcilable differences within an established religion. In the western world we tend to overlook Sikhism, but in sheer numbers it is one of the largest religious traditions. And of course, there are many, many others.

As with any over-simplified scheme that tries to make sense of history, I am certain that no historian will be convinced. To me it seems obvious. Once every five centuries or so, some new religion will be born and will flourish. Perhaps it is already among us. We are about due. Like the evolution of new species, some new religions are poorly adapted to survival: one thinks of Branch Davidians or Heaven’s Gate, or Jonestown. Others, however, quietly thrive until someone looks around and says, “Where did Mormonism come from anyway?” Some will argue that it is just another sect of Christianity. Those who study its theology will realize that its conceptual world is vastly different. But anyone with a long enough calendar can see that it began about five centuries after Sikhism and the Protestant Reformation occurred. And anyone with two cents can sense its enormous bankroll—no surer sign of a religion’s viability can be offered.