In the case of Washington, there's little need for assumption. One of the celebrants was a Presbyterian minister. And yes, the services the military chaplains perform are kinda religious in nature   **Upon arriving at the humble red brick tomb sunk in a hillside below the mansion house, the Reverend Thomas Davis, rector of Christ Church, Alexandria, read the Episcopal Order of Burial. Next, the Reverend James Muir, minister of the Alexandria Presbyterian Church, and Dr. Elisha Dick, both members of Washington's Lodge, conducted the traditional Masonic funeral rites. After this, the shroud was briefly withdrawn to allow a final viewing before Washington's body was placed in the family tomb. http://gwpapers.virginia.edu/project/exhibit/mourning/funeral.html  