I think this is likely due to some incidental correlations...
Those with Christian Nationalists views are more likely to support the party that's been in favor of flouting Covid precautions...I don't think there's anything about a Christian Nationalist viewpoint, in and of itself, that would cause one to be more or less hesitant about a particular virus.
...but I'm a heathen so what do I know lol.
I think the two main factors that are driving this are:
1) how "pro-" or "anti-" Trump one is
2) how authoritarian or anti-authoritarian one is.
Most of the people who I hear writing it off as a hoax certainly aren't Christian Nationalists, it's an-cap libertarians (many of whom are atheist, and certainly not nationalists)
That's the draw back of a society where everyone feels the need to virtue signal at the expense of literally everything else and common sense.
When you have a president as divisive as Trump in "the big chair", that's bound to happen.
I have no doubts that if Trump had "taken it seriously", and used it as an excuse for why he should be able to push through his various agendas, we'd see a 180 and we'd have his supporters wanting mask enforcement, and his opposition fighting against lockdowns, masking, etc...
"Trump said he's not going to wear a mask...so I'm not gonna wear one either! Murica"
vs.
"Trump said he's not going to wear a mask...so I'm going to post selfies of myself wearing one alone in my car to show how much I care #DoingMyPart #SaveLives #Wear
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View attachment 282365Mask"
There are people on both sides of this acting equally ridiculous...