Jew gotta see it to believe it.

A cheeky ad campaign, seeking to catch young Jews’ attention during the High Holy Days, is raising eyebrows uptown.

“Even if you think kugel is an exercise you do for your vagina . . . JewBelong,” reads one ad plastered on kiosks throughout the Upper West and Upper East sides, referring to a traditional Jewish noodle casserole that is easily mistaken for Kegel pelvic contractions.

“The kugel/kegel confusion is too good to ignore,” says Archie Gottesman, 56.

She and Stacy Stuart, 53, are the co-founders of JewBelong, a nonprofit that aims to bring “disengaged Jews” back into the religion through memes, online holiday guides, modernized prayers, meetups and ads.

They’re part of a new wave of local Jews looking to rebrand the religion; another organization called Kugel targets “hip, intellectual millennials and Gen Xers with a strong Jewish soul” with Shabbat soirees.

Gottesman and Stuart knew their slogans would get people talking: The two previously worked on those controversial ads for Manhattan Mini Storage. (Remember “When your closet is shrinking as fast as her right to choose”? That was them.)

“We have to take a bit of risk and push boundaries to get people to look up,” says Stuart.

Look up they did: Upper East Siders found that kugel ad so scandalous that they complained to the Madison Avenue Business Improvement District board in mid-September, 10 days after it was posted. Complaints spilled into JewBelong’s inbox, too.

“I saw your ‘vagina’ ad. Yuck. Was that really necessary? Yes, you’ve made me aware of your existence. I’ll be avoiding you,” wrote one critic.

Ultimately, JewBelong was asked to sub in a less salacious ad. Unfazed, they offered up a close-up shot of bacon and eggs, captioned: “So you eat bacon. God has other things to worry about.”

“Some criticism is a very small price to pay [to help Jews] find joy in a religion they thought had nothing to offer,” says Stuart.

She points to JewBelong’s fan base: Its email list, which offers nontraditional guides to Jewish practices alongside more serious articles about anti-Semitism and Israel, has about 40,000 subscribers — and the org has garnered some local love.

When New Rochelle resident Jackie Saril, 53, was sent pictures of the notorious kugel ad by friends, “I thought, ‘I don’t know who these people are, but anybody who can do an ad about Judaism that uses the word ‘vagina’ is OK in my book.’ ”

The ads have also gotten the seal of approval from a local Orthodox rabbi.

“If the ads get someone to stop and take just 10 seconds to think about being Jewish, then it’s a victory,” says Rabbi Chaim Steinmetz, of the Upper East Side’s Congregation Kehilath Jeshurun.

That’s a win for Gottesman and Stuart, who hope their ads will help to assuage some guilt for people who feel like “bad Jews.”

“We get it. We eat bacon too,” says Gottesman.