A 37-year-old teacher accused of creating a “secret society” to lure teenage girls into having sex with him was arrested Monday evening after a girl he allegedly wanted to recruit into the group complained to police, authorities said.

Robert Louis Rosseau taught Bible classes — among other subjects — to eighth-graders at Christian Academy of San Antonio.

Rosseau, who isn't certified by the state to teach, remained in Bexar County Jail on Tuesday on a charge of aggravated sexual assault of a child. He was being held on $100,000 bail.

Jim Bazar, secondary principal at the Christian Academy of San Antonio, said Rosseau “was terminated effective (Tuesday).”

“He has not been on our campus for several weeks,” Bazar said, adding the instructor was placed on administrative leave when the allegations were made early this month.

The principal said none of the alleged sexual acts occurred on campus and that only one of the three girls involved attends the school.

Authorities said Rosseau's secret society, which included him and two of the girls, began to unravel last month, when the third teen balked at joining the group.

That teen told authorities that the two girls who were members of the society, which they referred to as an “order,” attempted to recruit her into the group on two weekends in September. To become a member, the two girls told the teen, she had to be “intimate” with Rosseau to establish trust, according to an arrest affidavit.

The teen's resistance led to a fight Oct. 5 with the two girls, who allegedly attacked her after she tried to reveal the relationship to classmates at a local high school, which was not named in the affidavit.

Police were called to the school, and that's when the girl told authorities that Rosseau was trying to enlist her into the order and accused the teacher of having sex with the other two girls, the affidavit states.

The teen said the other girls told her that Rosseau had seen both of them nude, adding “this was a part of the trust that was needed for the ‘order' to operate,” the affidavit states. She also told authorities that the girls told her that Rosseau was in a lot “of pain” because she wouldn't join the group.

Initially, the two girls denied they were having sex with Rosseau. But on Oct. 21, one of the two told her parents that Rosseau had been sexually assaulting her since Jan. 9, when she was 16, according to the affidavit.

That teen told authorities she was persuaded into joining the order after being told it was “geared to help mankind,” the affidavit states.

She also acknowledged to authorities that she was encouraged to “demonstrate her trust and strict adherence to the society by engaging in sexual intercourse with (Rosseau),” the affidavit states, and that a sexual relationship ensued.

The affidavit states Rosseau would read Bible passages to the two girls “to legitimize his believed ability” to have sex with them.

Rosseau told the two girls they would need to engage in sexual activity with him if they wanted to maintain their friendship, and the girls complied, according to authorities.

The first teen to join the group denied that Rosseau was ever sexually active with her and discontinued an interview with police Oct. 20.

Police Department spokesman Matt Porter said the testimonies of the teen who refused to join the society and the teen who was allegedly assaulted helped provide evidence for authorities to arrest Rosseau.

Rosseau could face more charges, Porter said, as the investigation continues.