In South Carolina, evangelicals, conservative activists, and the GOP base are feeling pretty uneasy about the gubernatorial campaign of Nikki Haley.

You see, there’s that troublesome “heritage issue.” It’s bubbling up. Like sewer gas.

“The heritage issue is starting to bubble up on emails,” said former Charleston County GOP chairwoman Cyndi Mosteller, who supported Attorney General Henry McMaster in the gubernatorial primary. “I am hearing those questions.”

Haley, born Nimrata Nikki Randhawa, still attends Sikh services occasionally with her parents and extended family. In 2004, after winning her first term in the state legislature, the Charlotte Observer quoted Haley as saying she and her family attend “both” Methodist and Sikh services.

As routine as that may sound to families of mixed faith, her ties to the Sikh tradition have left some evangelicals in the state uneasy.

Ray Popham, pastor of Oasis Church International in Aiken, said Haley’s religion is a “big topic” among his congregants, who have posted notes about her religion on Facebook and have lately approached him for advice about the governor’s race.

“She claims to be a Christian but also attends a Sikh temple and was married in a Sikh ceremony, so a lot of people can’t figure how you can claim both,” Popham told CNN. “I think she needs to be straight up with people, if she is both. If she believes that you can be both, then she should say that up front.”

Tony Beam, the interim pastor of Mount Creek Baptist church in Greenville, hosts a radio show called “Christian Worldview Today.” He recently posed a question to his listeners: Is Nikki Haley being honest about her faith?

Beam said several callers were not sure if Haley had completely abandoned her Sikh beliefs.

“People want to know if she is being completely forthright about it,” said Beam, a Barrett supporter. “Once you commit to Christianity, it excludes other religions. I am not saying she is not who she says she is, but I do know those questions are being raised”