OK. If Trump is a Christian, he may only be a baby one, which does not translate into a model for believers or unbelievers. But this is separate from his presidential status. Jimmy Carter was supposed to be saved when he was president. However, not only was his presidency an appalling disaster, he is still siding with decidedly ungodly policy makers who seek to undermine this country. Don't get me wrong, I would "have all men to be saved, and to come unto the knowledge of the truth." But the one does not guarantee the presidential leadership needed for the country. Carter has been proving this daily.
When it comes to presidency, I'll take Trump's over Carter's, but even more so over Sanders' or Hillary's or Obama's. (The latter's, not Trump's, ushered in and emboldened the current division in America). In fact, I cannot think of any Democrat who opposes Trump whose presidency would be better than his. And there are many Republicans whose presidency I can imagine would be worse. What good is it being a vertebrate, if you're not going to use your spine?