People who have previously stated they are atheists but also are christian nationalists because they believe in the “cultural values” it grants. Generally just people with bigotries that line up with christian nationalism’s current targets.

“I’m an atheist, but I believe that being gay will destroy society and this CRT stuff will erode the moral values of this nation” that sort of shit. Sam Harris and Jordan Peterson are two that fit right into this mold. Though there have been atheists that have explicitly said they are also christian nationalists, they are just more minor public right wing figures who’s names I’ve already forgotten.