Christianity invented secularism
There is a growing delusion among, rather desperate, Christian apologists. As the delusion that America is a Christian nation slowly loses ground and America is really a secular nation, Christians are quick to argue that Christianity invented secularism. However, as we shall explain, this delusion is just as utterly false as the claim Christianity invented science.
Christian apologists argue that "separation of church and state" does not appear in the Constitution, and Jefferson proposed it to keep government out of the church (not the church out of government). Thus, apologists may argue that the vision of secularism is propaganda.
Apologists may argue the term secularism was an idea of the Bible, when coined by a Christian St. Augustine of Hippo, and the separation of church and state also has biblical origins when God would not allow kings to become priests to corrupt the people through the church (although the priests could influence the king). Therefore, secularism was an idea born of the Bible not the Enlightenment.
Some apologists go as far as believing that present day secularism between church and state has become a form of totalitarianism, which may will lead to eugenics. This leads apologists to argue that the only way to save secularism is the Church, since they are the ones who came up with it, because once we lose the Christian values and traditions will lead to a world far worse than anything Hitler could have ever conjured.
While it is true that the Constitution does not specifically say "separation of church and state" nor does it say any of the following: God, Jesus, Christ, Bible, Christianity, Trinity, Paul, disciples, etc. Apologists may point to that the Constitution was dated with the words "in the year of our Lord" but the tables can easily be turned by pointing out that the Constitution says Thursday, which is the date of worship for Thor, the god of thunder.
Apologists who make this argument are very unlikely, and perhaps unwilling, to look at history beyond their holy book. This is because they base history and their view of the world through the Bible as an accurate calender and historical text. Ignoring that the Bible was wrong about many historical events (such as Jericho, the consensus, Nazareth, etc) looking further back we can see that secularism did not start with the Bible. Tasmanians, Aetas and Negritos of the Philippines, Yaghans of Tierra del Fuego, the Veddahs of Ceylon, and African Bushmen all lived in secular societies before religion was introduced.
Many eastern societies lived under secular philosophies for centuries before Jesus (if he existed) was born.