Why don’t people think this country was founded as a Christian Nation?

Question by NONAME: Why don’t people think this country was founded as a Christian Nation?
Read THESE quotes before answering
“It is impossible to rightly govern a nation without God and the Bible.”
George Washington
“Founded on faith in God, the United States has been blessed as no other nation.”
Jeremiah Denton- Republican Senator Alabama
“In regard to the Bible, I have but to say, it is the best gift God has given to man.”
Abraham Lincoln
“Freedom prospers when religion is vibrant and the rule of law under God is acknowledged.”
Ronald Reagan
“My principal battle with the North Vietnamese was a moral one, and prayer was my prime source of strength.”
Jeremiah Denton- Republican Senator Alabama
“Let us raise a standard to which the wise and honest can repair; the rest is in the hands of God.”
George Washington
“Those who deny freedom to others, deserve it not for themselves; and, under a just God, can not long retain it.”
Abraham Lincoln
“Freedom is not a gift bestowed upon us by other men, but a right that belongs to us by the laws of God.”
Ben Franklin
“That this nation, under God, shall have a new birth of freedom, and that government of the people, by the people, for the people, shall not perish from the earth.”
Abraham Lincoln
Some teacher Trajan makes

Best answer:

Answer by ck4829
So how does of slavery, racism, burning “witches”, and the extermination of indigenous people fit into the idea of us being a Christian nation?

Know better? Leave your own answer in the comments!