Trump wasn't the only one pushing birtherism, just the most famous and persistent. A SoCal dentist, Orly Taitz, spent a fortune carrying that flag, even producing a Certificate of Birth from the Republic of Kenya that was determined to be a fraud. The Republic didn't exist when Obama was born.
Obama attended two Catholic elementary schools in Indonesia, for a total of 3 1/2 yrs, and was listed as Muslim, because that was his step-father's religion. And he was reputed to be anything but devout...
It was Obama's father's stepmother, Sarah Obama, who was incorrectly reported to have said he was born in Kenya. She said in numerous later interviews that she never said that, and that he/Obama was born in Hawaii.
Well a number of polls show that many people still believe in Santa Claus, and that he is, most certainly, white.