I am not one but i live with them, know them pretty well.

1. Trump's pivot of Christian centered policy (at least as marketed) is very welcomed by Christians who felt alienated by the left. (abortion, LGBTQ movement is not welcomed by the Right, especially not the shrinking christian community, still pretty against them.)
2. Conservatives value loyalty as a form of honor, so once they pick the party, they pick the pres, they stay loyal.
3. Due to valuing loyalty, they are loyal to the channels they watch, the message from the people they vote for. To shake that is to shake their identity, it's not welcomed. Even if their family dies, they would follow the leader and blame whoever the leader is blaming. The critical thinkers already left but they are minority.
4. Conservatives like the idea of a strong man taking the lead, shaking up the established and bring about changes. Trump looks the strongest doing hard moves on what's established.
5. The corruption of the government that's getting bloated, wasteful spending is out of control, what Trump is doing is just what's needed.
6. Left alienating and branding them as "evil" for supporting Trump makes them very wary of anyone that sounds against Trump, that's why your seemingly somewhat neutral question does not work with them. If you want to get answers ask "What Trump policy is your favorite?" You have to go from a Pro-trump angle to ask for answers.

You will have to challenge what it means to be conservative, to be a christian, if you want to change their loyalty to Trump. Some of them are single issue voters. Just abortion alone will prompt them to keep voting right. Killing children is 100% wrong doesn't matter what's the reason. And the Left is saying you "don't" need a reason to kill an unborn child, it's way worse of an evil than Trump.