Separation of Church and State?

I'm reading a book called "1776" by, author, David McCullough. I found, in it, this quote from Nathaniel Greene, leader of the Rhode Island Kentish Guards and one of George Washington's most trusted officers. I felt like it really sums up the sentiment upon which this nation was founded. It also is evidence that these men were men of God and intended for God to be part of this nation. Before this point, the colonials were not interested in independence from Britain, then on January 1, 1776 the colonials received a copy of a speech given, by King George III, to Parliament in October 1775. King George III had declared the the colonials as traitorous rebels. This caused the colonials to desire Independence from Britain instead of reconciliation. Here is what Nathaniel Greene had to say:

"Heaven hath decreed that tottering empire Britain to irretrievable ruin and thanks to God, since Providence hath so determined, America must raise an empire of permanent duration, supported upon the grand pillars of Truth, Freedom, and Religion, encouraged by the smiles of Justice and defended by her own patriotic sons...Permit me then to recommend from the sincerity of my heart, ready at all times to bleed in my country's cause, a Declaration of Independence, and call upon the world and the great God who governs it to witness the necessity, propriety and rectitude thereof."
- Nathaniel Greene

God bless the United States of America