President Trump said last week that he doesn’t know whether it’s his job to uphold the U.S. Constitution. That explains a lot about his actions — including his recent dismissal of church-state separation, a constitutional principle that protects religious freedom and legal equality for all.

At a May 1 White House rose garden event on the National Day of Prayer, which did include prayers offered by a rabbi and imam, Trump announced an executive order creating a Religious Liberty Commission stacked with his supporters. Trump took credit for “bringing religion back to our country” — a ridiculous claim. Noting that critics might raise concerns about church-state separation, Trump said, “Let’s forget about that for one time.”

Trump’s comments reflected how fully he has embraced his marriage of convenience with the religious right movement. Many of Trump’s allies want us to “forget about” separation of church and state, which some call a “myth.” In truth it is a central feature of our constitutional form of government and we must not allow it to be dismantled in pursuit of making America a “Christian nation.”

Many members of Trump’s new Religious Liberty Commission raise red flags. One of them is Eric Metaxas, a conspiracy theorist and cultish Trump devotee who, like fellow........

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