I won’t comment on white Christian nationalism.
Christian nationalism flows from the Declaration of Independence and is a cornerstone of our view of sovereignty.
While I understand small numbers of people will think and believe anything, I don’t believe any religious or political leader of stature commented along the lines that Cristian Nationalism is exclusionary, anti-democratic or gang-like. Such views are facially ridiculous.
So what is Christian Nationalism? Well, it’s not a group of people; instead, it’s a belief that Jefferson stated very well in the Declaration of Independence.
“We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.--That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed,”
Basic human rights do not come from kings or other rulers; they come from the creator. . Governments are formed to secure these rights. ( An atheist might believe these rights exist in nature). This is Nationalism and Christianity.
I don’t accept any view of Christianity or nationalist proposed by people who are neither. In all cases, they intend their view to be a pejorative.