At first, I was thinking Trump was like a John the Baptist figure. Indeed he is a fiery preacher from the wilderness. But he is from the political wilderness, a political preacher... not a holy man like John the Baptist. That does not fit. However, based upon Trump's Christian friendly positions, he is very much like Emperor Constantine, don't you think?
[STAFF EDITED]
"The doctrines of piety have been brought to ruin and the laws of the church are thrown into confusion. The ambition of those who do not fear the Lord rushes into the foremost positions, and episcopal office is now publicly known as the prize of impiety. The result is that the more a man blasphemes the more worthy people judge him to be a bishop." (Letter 92.2)
- St . Basil
After Constantine legalized Christianity, under the Edict of Milan in 313, pagan elites in search of notoriety and political gain filled the institutional church. In this season of significant transition in the Roman Empire, opportunists took the title "Christian" and sought ecclesiastical positions to improve one's socio-political status. People became Christian in name only, thus compromising the morality of the church. Already at the Council of Nicaea in 325, church officials recognized that too many ill-prepared pagan converts had been promoted to positions of leadership.
By the 360's and 370's, Basil perceived this leadership crisis as a "shipwreck" plunging Christians into a sea of ignorance, division, and ungodliness.
https://www.cappadociahistory.com/post/st-basils-monastic-vision
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The attempt by the OP to compare President Trump as the modern day Roman Emperor Constantine who brought an end to the persecution of Christians might be closer to the truth than one might think - but not for the obvious reasons!
Once the Edict of Milan (313 AD) made Christianity respectable, it triggered a stampede of new coverts - many of whom saw it as nothing more than a convenient vehicle to promote their secular political, economic and social aspirations!
Many true Christians, such as St. Basil, appalled at what they saw as the new "imperial" Church being inundated and controlled by corrupt opportunists, decided to withdraw from society and establish the monastic movement, whereby dedicating themselves to lives that exemplified the teachings in the New Testament!
St. Basil would have viewed conservative Christians embracing a boastful, billionaire "narcissist" like Donald Trump, who represents the very antithesis of their religious beliefs, as just another example of history repeating itself!