Christian Nation?

This is a reposing of a Facebook comment I made that became more elaborate as I continued writing it, I thought the internet might find it interesting. The post I was responding to was a secular person making a statement about christian calling america a christian nation and how that wasn't correct.

Here is my two cents:

There is a twist to this story that neither side seems to want to admit. Secularism is a Christian concept. So, if America was designed in the beginning as "secular nation" then calling America a "Christian Nation" makes sense based upon the history of where secularism came from. Secularism is an idea that was more or less inspired by Martin Luther and the reformation. The political purpose of secularism is to create and enforce laws in a nation/country where there isn't a single dominate religious basing. Secularism in theory is an idea which creates laws, rules and regulations that favor no specific religious perspective. Secularism wasn't created with the idea that atheist/freethinkers/and so on were included in secularism. It was a social contract among competing Christian groups that compromised in order to mutually benefit economically from a collaboration free from in fighting. It wasn't until the last hundred years or so that secularist (atheist/agnostic/free thinkers) started trying to reclaim history in order to write their own cultural narrative in order to include themselves into the origins of this country. While some (not all or even most) of the founding fathers/mothers were deists or freethinkers Non-were atheists, and their intended purpose was not to put atheists/agnostics/and so on in equal footing with religious land owners. Personally, I think the "Christian nation" dispute is a huge historical misunderstanding gone horribly wrong. 

Main Reference:
After God by Mark C. Taylor