Obama's Kenyan birth father: In Islam, religion passes from the father to the child. Barack Hussein Obama, Sr. (1936%u20131982) was a Muslim who named his boy Barack Hussein Obama, Jr. Only Muslim children are named "Hussein".
Obama's Indonesian family: His stepfather, Lolo Soetoro, was also a Muslim. In fact, as Obama's half-sister, Maya Soetoro-Ng explained to Jodi Kantor of the New York Times: "My whole family was Muslim, and most of the people I knew were Muslim." An Indonesian publication, the Banjarmasin Post reports a former classmate, Rony Amir, recalling that "All the relatives of Barry's father were very devout Muslims."