Every religion has been riven by struggles over authenticity.

Buddhism began when a maverick Hindu prince inspired disciples to embrace asceticism. Judaism sprouted branches, from ultra-orthodox to ultra-liberal, even Jews for Jesus. Christianity went through profound splits, such as the 16th-century Protestant reformation and the 19th-century Mormon movement.

Now the Baha'i Faith, the organization representing the most recent sect to spring from Islam, is struggling to defend its identity in federal court in Chicago, where North American Baha'is have been based ever since believers came to the U.S. about 90 years ago. It contends that a tiny band of believers known as the Orthodox Baha'i Faith can't call themselves Baha'i or use one of its key symbols without violating trademark law or a court ruling from more than 40 years ago.

In the hands of the federal 7th Circuit Court of Appeals, the case could set a precedent for settling religious schisms, doctrinal disputes and claims to truth by way of the U.S. judicial system.

"The word Baha'i carries with it implications for a certain set of beliefs — and we have to protect that," said Robert Stockman, a practicing Baha'i and religious studies instructor at DePaul University.

Adherents of the Orthodox Baha'i Faith believe the international community has strayed from the religion's original teachings. That, they say, threatens to interfere with God's plan for the world.

Baha'u'llah, who founded the faith in Iran in the mid-19th century, is regarded by Baha'is as the most recent messenger of God in a long line including Abraham, Buddha, Krishna, Jesus and Muhammad. Baha'is believe Baha'u'llah revealed God's plan for humanity to one day unite into a single race.

On its www.truebahai.com site, the orthodox group faults the mainstream denomination for corrupting that plan by electing a legislature to govern instead of abiding by the succession of guardians prescribed by the founding prophet.

The mainstream Baha'is have responded with a lawsuit to bar the orthodox from calling themselves Baha'i and from sharing the "The Greatest Name," a sacred and trademarked symbol. Baha'is believe they are not only safeguarding their identity, they are defending the truth with a capital T.

The orthodox say that is not a matter for the courts to decide.

The Baha'is first took breakaway believers to court in 1966 after a tumultuous time internally. Nine years earlier, Shoghi Effendi, guardian of the faith and a direct descendant of the founding prophet, had died unexpectedly and allegedly without tapping a successor.

Leaders decided that a Universal House of Justice envisioned by Effendi would oversee the faith. But shortly after the leaders announced their solution, one of them declared that Effendi actually had intended for him to be the next guardian. Charles Mason Remey, then in his 90s, said Effendi had addressed him in letters as his son or spiritual descendant.

The National Assembly of France and about 100 others followed Remey. But the rest of the Baha'i community expelled him from the faith and successfully sued his followers, barring them from calling themselves Baha'i and using the sacred symbol. Remey's group disbanded, but orthodox believers reorganized and continued to maintain the guardianship.

Thirty years later, Jeffrey Goldberg, a Baha'i in Barrington, Ill., came upon the splinter group on the Internet. He became convinced that he had been duped by the mainstream Baha'is. Goldberg quietly resigned from the community — with no explanation, because he knew the consequences. When Bahai's are declared covenant-breakers, they are shunned or ostracized.

But Janice Franco wouldn't let Goldberg go that easily. She insisted on knowing why he left. After plunging herself into Baha'i literature, Franco decided Goldberg might have a point.

Both Goldberg and Franco were declared covenant-breakers and shunned. Goldberg's wife was encouraged to divorce her husband.

In 2006, the mainstream Baha'is filed a lawsuit, accusing the orthodox believers of violating the court order issued 40 years earlier.

The Orthodox Baha'is insist they aren't the same group. They also say a religious denomination can't trademark truth. The term Baha'i refers to a follower of Baha'u'llah. That applies to them, they say.

Though the mainstream denomination would not explain why it waited four decades to enforce the court ruling, experts say modern missionary methods might be the reason. Barring the orthodox believers from using the name "Baha'i" would keep them from popping up in a Google search.