This. ^^^^
This is why I marked "no". He doesn't seem to meet any of the definitions of Christian I've seen anyone in the mainstream use. The closest he seems to get is that if he registered for CF and selected "non-denom" (as he now claims) and clicked whatever statement of faith you'se guys are required to acknowledge, then he would be an unquestionable Christian on this site. (This is a wise choice by the owners.) Since he isn't a CF poster what other criteria might we use:
1. Belief in "one triune god". This is a basic component of Trinitarian Christianity. Does Trump believe this. We've seen no expression of it from him. He may have some vague notion of a god of some kind, but what that might be is unknown.
2. "Accepts Jesus as his savior". Another common statement from Christian to indicate their alignment and belief. Again. we've seen no such expression from Trump of this either. He also seem to have at various points mocked or dismissed basic Christian practice such as communion and confession.
3. Participation in Christian worship or ritual. Many Christians consider this to be a key aspect of being a Christian (or at least one worthy of the name). Has he been initiated into his "new church"? (Doesn't seem so.) Does he go to services? (I think only a few times during his presidency and all at Xmas and [perhaps, I don't recall] Easter) Is he known to prey or ask for devine guidence? (No evidence of this. And, yes I know about the various times the preachers have come to the oval office and prayed over him.)
4. Permanent attachment. Some Christians have unbreakable ways to be labeled Christian forever. The notion of "once saved always saved" is used in some churches. (Trump has never claimed the type of saving event I've heard from so many Christians.) Some churches consider baptism (or perhaps confirmation?) to be a permanent attachment to the church) to grant permanent status in their church. He was baptized in the Presbyterian church (and confirmed, I think). Maybe the Presbyterians consider him by this to still be a member of their church. I know the RCC would still consider me to be a Catholic and they may even be counting me in at least one diocese on their census.
Short version. By the standards various kinds of christians apply, Trump does not seem to be a Christian. I am certainly not the arbiter of this, but good news for all of you out there: I (and many other non-Christians) don't pin him on you guys.