Perhaps that should not be surprising when dealing with wild smear tactics. Secular humanism is not a political movement, and secular humanists cover a wide spectrum of political views. In America, some secular humanists are active in the Democratic Party, many others are staunch Republicans, Libertarians, Socialists, Greens, etc. One political view that secular humanists do share is unswerving support for democracy, freedom, and human rights. All secular humanists are utterly opposed to totalitarian systems like communism and fascism.
Secular humanists are unpatriotic.
So let's start by dismantling that claim. The United States Constitution and Bill of Rights contain no references to God or Christianity. The Pledge of Allegiance did not contain an oath to God, until it was added in the 1950s McCarthyite era. The myth that the United States of America was founded as a Christian nation is perhaps best refuted by the words of the U.S. Senate itself. In fact the remarkable thing about the United States is precisely that it was created as a secular republic organized around the rights and freedoms of its citizens.