Trump has supported public policy issues that are important to Christians. That doesn't make him a Christian, let alone a mature Christian. And, yes, many Christians are in error in presenting Trump as a Christian. If he is saved, he has not made the kind of confession of faith necessary for salvation public, and for Christians to imply otherwise compromises the Gospel.
I'm not a big fan of the "Religious Right". Many of them are some of the worst warmongers in Washington, DC. They cause ordinary folks to wonder if Christians have become bloodthirsty. Our Lord and Savior is, after all, the Prince of Peace, yet so many religious conservatives have never found an opportunity for war they could refuse. And I will certainly agree that Donald Trump has act in un-Christian ways many times. I don't hold him up as a role model on how to live for Christ.
But if Donald Trump is un-Christian, Hillary Clinton (and much of today's Left) is anti-Christian. Hillary and her followers actually discussed a scheme to bring about a "Catholic Spring" where liberals would join the Catholic Church and seek to change its doctrines on a number of issues. This is not Martin Luther nailing his 95 theses to the Cathedral Door at Wittenberg and it is not calling out racist Congregations in the Jim Crow South. This is infiltrating the Church to manipulate it for political purposes.
That comment was obviously a joke. Hillary Clinton is clearly far more devout than Donald Trump is (assuming he's even a believer and not just appeasing conservative Christians the way Putin appeases the Orthodox Church) and said earlier this year she's considered joining the ministry. Hardly "anti-Christian."
Why would liberals "infiltrate" the Catholic Church to push doctrinal change? It's not like you get to vote. That's not how the Catholic Church works. That's why most progressive Christians are in mainline Protestant denominations.