On a Sunday morning at Beth Israel Worship Center in Wayne, N.J., a bearded pastor named Jonathan Cahn stood on an elevated platform, gazing over a full house. Stage lights shifted from blue to white as the backing band played a drifting melody. Two men hoisted curled rams’ horns and let out long blasts.

“Some of you have been saying you want to live in biblical times,” Mr. Cahn said, pacing behind a lectern. Then he spread his hands wide. “Well, you are.”

Sitting at the end of a sleepy drive an hour from Manhattan, Beth Israel may look like any common suburban church. But the center has a highly unusual draw. Every weekend, some 1,000 congregants gather for the idiosyncratic teachings of the church’s celebrity pastor, an entrepreneurial doomsday prophet who claims that President Trump’s rise to power was foretold in the Bible.

Mr. Cahn is tapping into a belief more popular than may appear.

A recent Fox News poll found one in four Americans believe “God wanted Donald Trump to become president.” Celebrities like the televangelist Paula White and Franklin Graham have boosted the idea. The president’s own press secretary suggested as much in a January interview. And on the opening day of the Conservative Political Action Conference this month, the millionaire businessman Michael Lindell took to the stage and declared President Trump “chosen by God.”