What is the subject of the sentence? A Trump supporter or Christianity? Or is the subject none other than "A Trump supporter or Christianity" - that is, the poster forgot to put "or" there?
Another possibility is: the subject is "A Trump supporter's
That's all you have to quote about? Not the other truths that exists in a Trump supporters OBVIOUS anti-Christian head? A Trump supporter Christianity is what's going to make God destroy the world and make Revelation come true. I'm not sure I'd be proud of that. Being the bad guys and everything...
Source: monitoring Trump and relevant contemporary events