Five years before Lance Wallnau joined Republican gubernatorial candidate Doug Mastriano on the campaign trail, the Texas-based evangelist told his audience in a livestreamed video about how an “anointed cake” baked by prostitutes once resulted in a gay man becoming heterosexual.

“Now, I’m not saying this is going to work for you,” he says in the video, before recalling a story he’d heard of “hookers” in a bar transforming its “very adamantly anti-Christian” proprietor.

“The power of God hit him while he was eating the cake,” Mr. Wallnau said in the clip, first reported by the Dallas Morning News in 2017.

That same year, Mr. Wallnau, a self-styled Christian “prophet” whose stump speech for Mr. Mastriano blew up on Twitter over the weekend, posted another outlandish rant online, explaining his theory that the Women’s March on Washington and protests of Donald Trump’s inauguration were manifestations of “the spirit of Jezebel.”