-George Washington did not take communion, and refused prayers or the presence of a minister while on his deathbed
-John Adams had a dog named Satan
-Thomas Jefferson observed Ramadan in December 1805, while hosting a Muslim envoy from Tunis
-Thomas Jefferson wrote a version of the Gospels that stripped out of all miracles (including the resurrection) and any reference to the supernatural or divine
-Mary Lincoln held a séance in the White House
-Abraham Lincoln was shot on Good Friday
-Ulysses Grant was never baptized, and got in trouble for refusing to attend religious services while a student at West Point
-Calvin Coolidge was the first President to have a Christmas tree in the White House, and make Christmas into a public celebration
-"Under God" in the Pledge of Allegiance, and "In God We Trust" as the motto, weren't added until Eisenhower was President
-Bill Clinton was the first president to light a Hanukkah menorah, but George W. Bush was the first to have a White House Hanukkah celebration and light the menorah in the WH residence
SourceAnybody have more?