In 1964, a young boxer named Cassius Marcellus Clay Jr. won an upset victory over Sonny Liston. Later that year, Clay changed his name to Cassius X, then to Muhammad Ali. Ali said that he changed his name because “Clay was a white name,” while “Muhammad” and “Ali” weren’t. Oddly enough, Muslim sources say that Muhammad was white, and that both he and his son-in-law Ali owned black slaves. Even more strange, Muhammad Ali was originally named after Cassius Marcellus Clay, the nineteenth century Kentucky abolitionist who helped convince Abraham Lincoln to issue the Emancipation Proclamation. Hence, the greatest heavyweight boxer of all time was deceived by Islam.
Check out this excellent video from David Wood (Acts 17 Apologetics)