I've spent hours looking through Washington's letters to find a less than prepared statement. It's hard to find after Yorktown. the man was so engaged with classical poetry (i'm convinced) that he was convinced that the key to immortality was via posterity and poets. Not through Religion.
Naturally, after Yorktown, everything he wrote and recorded was orchestrated and tailored for future generations to dissect. Still, his personal letters hold some bite and honesty to them. This is just an example. He probably laughed when he said it.