Yeah, I got that you didn't say "misuse the Bible," though I think when politicians use the Bible they are trying for a connecting point with people who believe in it.
But as far has manipulating Christians, having been a Christian for a long time, we notice when the politicians are specifically trying to court the Christian vote, and sometimes specifically the evangelical vote. It's often a manipulation to get elected (though presidents Jimmy Carter and George W. Bush were Christians themselves).
Just some examples:
Ronald Reagan worked with Jerry Falwell to register millions of evangelical voters to win the election. (
https://www.salon.com/2014/05/18/the_evangelical_presidency_reagans_dangerous_love_affair_with_the_christian_right/)
"Before serving as vice president to Ronald Reagan, the elder Bush, in interviews, referred to evangelicals like Pat Robertson as "snake handlers and swindlers." Coincidentally, he would later run against Robertson in the Republican primaries, by which point the evangelical voting bloc had become a significant portion of the Republican party. Recognizing that the bloc could help him get elected in 1988, the elder Bush enlisted missionary and policy adviser Doug Wead to improve his standing among evangelical Christians during his vice presidency, and into his presidency." (
https://classroom.synonym.com/the-evangelical-influence-on-the-bush-presidencies-12085971.html)
"Bill Clinton in 1996 won the majority of freestyle evangelicals. But in 2000, George Bush won the majority of freestyle evangelicals. It shifted by about 10 percent away from Gore towards Bush, which, in an election that close, it was a very important shift. ... But it is a group that's fluid and in play and can be gotten by either candidate." (
https://www.pbs.org/wgbh/pages/frontline/shows/jesus/evangelicals/vote.html)
"Why did Obama win more white evangelical votes than Clinton? He asked for them." (
https://www.washingtonpost.com/posteverything/wp/2016/11/22/why-did-obama-win-more-white-evangelical-votes-than-clinton-he-asked-for-them/)
"The white evangelical vote has been a focus of post-election coverage, and for good reason. If you had told the average person that white evangelicals would account for more than a fourth of the entire electorate, they may not have believed you: After all, evangelicals are often imagined as a fringe population. But they represented more than a quarter of the electorate in 2012 and 2008, and again this year."
So, if every president tries to woo the evangelical vote and manipulate Christians, why is Trump the anti-christ for doing it?