At least Marjorie Taylor Greene believes Christian nationalism exists

She makes no bones about it. She is a Christian nationalist. Watch:

It is worth noting that this is a different rhetorical strategy from the one employed by Pennsylvania gubernatorial candidate Doug Mastriano.

Here is a taste of Eliza Griswold’s May 2021 profile of Mastriano at The New Yorker:

Many white evangelicals reject the Christian-nationalist label. “Christian nationalism doesn’t exist,” Franklin Graham, the evangelical leader, told me, calling it “just another name to throw at Christians.” He added, “The left is very good at calling people names.” Mastriano also rejected the phrase, writing to me, “Is this a term you fabricated? What does it mean and where have I indicated that I am a Christian Nationalist?” 

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On Doug Mastriano’s 2001 paper “The Civilian Putsch of 2018” Doug Mastriano’s connection with Gab The Nixon Library has released another recording in which Billy Graham and Richard Nixon discuss Jews and the “Synagogue of Satan” Doug Mastriano airs his first television ad. It looks like he may be actually running for governor of Pennsylvania