Mr. Fatoyinbo said on Instagram that many people have used similar accusations to try to extort him and the ministry. “I have never in my life raped anybody even as an unbeliever,” wrote Mr. Fatoyinbo, who declined multiple interview requests.

Image Pastor Biodun Fatoyinbo Credit...

In an interview at her home in Lagos, Ms. Dakolo said she had come forward after she and her husband, a well-known pop star, heard that the pastor had continued to assault other congregants.

But the personal cost, she added, had been high, and had included telephone threats, internet harassment and an extremely difficult discussion about rape with her three children.

“You begin to ask yourself, " she said, “did I do the right thing?”

Religion is an overwhelming force in Nigeria, a country of nearly 200 million people that is roughly split between Christians and Muslims. Billboards for famous pastors dot the highways, an annual redemption camp attracts millions of people, and some preachers are more visible than political leaders.

In recent years, Mr. Fatoyinbo has grown his ministry, the Commonwealth of Zion Assembly, into a five-city force among the country’s many Pentecostal megachurches.

Young and tech-savvy, he preaches an increasingly popular theology called prosperity gospel that posits that success can be achieved through faith and donations to church.

Congregants enter his sanctuary on a red carpet and follow his adventures — his birthday party on a yacht in Dubai, for example — in the news.