Di'Anno's religious affiliation is made uncertain by his own words; he has given interviews that contradict each other on this subject, perhaps as a practical joke. He has a tattoo on the back of his head that says "666" and "GOD = SUCKER". According to his autobiography, he converted to Islam in the 1990s after reading the Qur'an. However he has subsequently reversed that position: "I think religion kills everybody. I don’t believe in it. ... No, my father was a Muslim, I must admit. But I don’t give a fuck." In later interviews Di'Anno clarifies that he never was a true Muslim, that he never stopped drinking, but tried to become a better person by applying some of the Muslim philosophies to his life. His autobiography furthers the confusion, in various passages he claims to be Muslim, Catholic, Jewish, and Aborigine.