Cameron Taylor Heath, 39, was booked into the Orange County Jail for lewd and lascivious act with a minor under 14.
According to the Orange County Sheriff's Department, deputies began looking into Heath in October.
"During the follow-up investigation, it was discovered that several years earlier, the victim was sexually abused by the family's bible study group leader, Cameron Heath," said the department in a statement.
Investigators say Heath was actively involved in several community and faith-based organizations.
They said he served as a member of Generations Church in Placentia and ran the Action Kids youth fitness center from 2010 to 2012.
Heath also led a bible study group known as "The Branch" and was the founder and president of "Deed and Truth Ministries," a San Diego-based nonprofit supporting orphanages in Baja California.
The sheriff's department said due to Heath's access to minors, investigators believe there may be additional victims.
Anyone with information, or anyone who believes they may have been a victim, is urged to contact the Orange County Sheriff's Department Special Victims Detail at 714-647-7419 or 714-647-7000.
You can also submit an anonymous tip to Orange County Crime Stoppers by calling 855-TIP-OCCS.