I did some homework this evening.  Here's what I dug up:

Christian Nationalism makes a false claim, that this country is a Christian country.  America was founded on the notion that “government shall make no law respecting an establishment of religion”.

 “Christian nationalism is the belief that America should be defined as a Christian nation, with government adherence to this ideology.”

“Although orthodox Christians participated at every stage of the new republic, Deism influenced a majority of the Founders. The movement opposed barriers to moral improvement and to social justice. It stood for rational inquiry, for skepticism about dogma and mystery, and for religious toleration. Many of its adherents advocated universal education, freedom of the press, and separation of church and state. If the nation owes much to the Judeo-Christian tradition, it is also indebted to Deism, a movement of reason and equality that influenced the Founding Fathers to embrace liberal political ideals remarkable for their time.” 

Not all founders of this country were Christian.

For instance:

Thomas Jefferson, an American Founding Father, the principal author of the U.S. Declaration of Independence, and the third President of the United States. 

James Madison, "Father of the United States Constitution", one of the Founding Fathers of the United States, and the 4th President of the United States

George Washington, Abraham Lincoln, Benjamin Franklin  to name a few.

 “This is a partial list of people who have been categorized as Deists, the belief in a deity based on natural religion only, or belief in religious truths discovered by people through a process of reasoning, independent of any revelation through scriptures or prophets. They have been selected for their influence on Deism or for their notability in other areas.”

“The idea of separation of church and state ensures the government cannot exercise undue influence over Americans' spiritual and religious lives. From ending school-mandated prayer to banning the government from coercing Americans to participate in religious activities, the wall of separation has been an essential tool in building a freer democracy.

And this uniquely American approach has resulted in one of the most religiously diverse nations in history.” 

GOOGLE  IT & MAKE AN INFORMED DECISION 

BEFORE YOU VOTE