I have found that you don't have to confront them in an aggressive way that tell them that you strongly disagree that God would support Trump and another Presidency. That in my opinion Trump represents everything Jesus warned us about and preached against.
And let it go and walk away. If they want to discuss -- really talk, then you can. If you respond in a respectful way (not how they were told people who disagree with them would respond), it can sometimes throw them more.
Sometimes these people are in such a bubble that merely saying you disagree throws them for a loop and even that can begin to cause them to reflect. It can be a surprising response actually.
They sometimes don't respond well either -- but that is ok too. Walk away. And, frankly, anyone who saw the interaction will understand and witness that you were the reasonable one in your interaction.
(I am not talking about the people going to rallies, etc. There is more going on there.)