Year after year, thousands of Americans attend the March for Life, marching past the U.S. Capital on a late January date close to the anniversary of Roe vs. Wade.

Most of the marchers are young and come by bus from Catholic and evangelical schools. While most of the groups present are conservative, there are smaller groups like Secular Pro-Life and Democrats for Life. Most of the banners contain slogans such as, "Abortion Hurts Women," "Love Life, Choose Life" or "We are the Pro-Life Generation."

Things were different at the Save America March backing President Donald Trump's efforts to flip the 2020 election. Some banners contained messages like "Jesus is my Savior, Trump is my President." But many more proclaimed "Stand with Trump!" or "Trump 2020: No More Bulls--t."

It's one thing to march for a cause. It is something else to hail a political leader as the key to saving America, said Southern Baptist Seminary President R. Albert Mohler, Jr., a central figure in evangelical debates about Trump.

"The American experiment in ordered liberty is inherently threatened by a cult of personality. And we saw the results of that. … So many of those who were there as protestors explicitly said that they were there in the name of Donald Trump," said Mohler, in a podcast the day after U.S. Capitol riot. "It was Trump that was the name on the banners. They were not making the argument about trying to perpetuate certain political principles or even policies or platforms."

History shows that personality cults -- left or right -- are dangerous, he stressed. After this "American nightmare," Christians should soberly ponder the "way sin works" and its impact on powerful leaders who are tempted to become demagogues.

"Demagoguery simply means that you have a character who comes to power on the basis of emotion, rather than argument, and passion rather than political principles," said Mohler.

It's crucial to know that, in 2016, Mohler was numbered among evangelical leaders who opposed Trump's candidacy. When the New York City billionaire clinched the GOP nomination, Mohler tweeted: "Never. Ever. Period."

But in 2020 he said he would vote for Trump in support of the Republican Party, thus opposing the Democratic Party platform.