Simone Biles and her family are listed as Catholic on Wikipedia.
Biles was raised by her maternal grandparents, Ron and Nellie Biles, after she and her siblings spent time in foster care. Ron and Nellie formally adopted Simone and her younger sister Adria in 2003, and the family settled in the Houston area of Texas.
Her Catholic identity is sometimes confused with her Belizean connection. Biles holds Belizean citizenship through her adoptive mother, Nellie, and has described Belize as her second home; that heritage is separate from the family’s listed religion.
Biles’s faith has also appeared in coverage of her life outside competition. Her public story includes family, adoption, training, education, and international heritage—not just her Olympic and world-championship records.