On December 13, 1799, Washington (aged 67 years) was exposed to a storm of sleet and developed a cold. He rested in bed at his home in Mount Vernon, Virginia.
On the morning of the 14th at 3:00, he had a severe attack of membranous croup. At daybreak, Mrs. Washington sent for the only physician, Dr. Craik. Two other physicians also came, but all three together could not save him. Washington died between 10:00 and 11:00 that night.
About four hours before Washington’s death, Father Leonard Neale, a Jesuit priest was called to Mount Vernon from St. Mary’s Mission across the Piscataway River. Washington had been an Episcopalian, but was baptized into the Roman Catholic Church that night. After Washington’s death, a picture of the Blessed Virgin Mary and one of St. John were found among the effects on an inventory of articles at his home
George Washington had an interest in Roman Catholicism for many years. His servant Juba stated that the General made the Sign of the Cross before meals. He may have learned this practice from his Catholic lieutenants, John Fitzgerald or Stephen Moylan. At Valley Forge, Washington had forbidden during “Pope’s Day,” the burning in effigy of the Roman Pontiff. As President, Washington slipped into a Catholic Church several times to attend Sunday Mass.
However, they do not provide any hard evidence on this site which is kind of a sensationalist antiMasonic site and I didn't really see any great convincing data on any others on a quick glance, so until we come up with some better information, we may simply have to disagree as to what really happened.
Probably so. Ultimately, who baptised Washington doesn't really "prove" any religion right or wrong.