If you were to read HR 306, which I do not recommend for those valuing truth or sanity, you will see that it begins with 17 "Whereas" provisions in an attempt to invent a secular purpose. I won't go through them all -- it is mind-numbing enough to read legislation, let alone ignorant legislation. It is sufficient to highlight a few of the more egregious examples.
MORE: http://ffrf.org/news/blog/item/17692-%E2%80%9Cdon%E2%80%99t-know-much-about-history-%E2%80%93-the-pennsylvania-house%E2%80%9D