Exodus leaders claimed its network of ministries had helped tens of thousands rid themselves of unwanted homosexual urges. The notion that homosexuality is not inborn but a choice was seized on by conservative Christian groups who oppose legal protections for gay men and lesbians and same-sex marriage.

But the ex-gay movement has been convulsed as the leader of Exodus, in a series of public statements and a speech to the group’s annual meeting last week, renounced some of the movement’s core beliefs. Alan Chambers, 40, the president, declared that there was no cure for homosexuality and that “reparative therapy” offered false hopes to gays and could even be harmful. His statements have led to charges of heresy and a growing schism within the network.

“For the last 37 years, Exodus has been a bright light, arguably the brightest one for those with same-sex attraction seeking an authentically Christian hope,” said Andrew Comiskey, founder and director of Desert Stream Ministries, based in Kansas City, Mo., one of 11 ministries that defected. His group left Exodus in May, Mr. Comiskey said in an e-mail, “due to leader Alan Chambers’s appeasement of practicing homosexuals who claim to be Christian” as well as his questioning of the reality of “sexual orientation change.”

For the rest of the story, head to the New York Times.