You had no facts to repudiate. And this claim of yours, "The belief in God is written into all of the documents used to begin this nation", well I think you should read the Constituion. No such enumerated belief exists.
In the environment of the day, in a time when men had been debating the role of God in government for decades, in a nation whose founding document declared that rights were endowed by a Creator, in a convention stuffed full of Christians framing a document for a nation that was 95% Christian or more, such an enumeration would be unnecessary. It would be like beginning every sports page article sabout NASCAR with a detailed account of how the internal combustion engine works.