Pope Leo XIV proclaimed a 15-year-old computer genius the Catholic Churchs first millennial saint, along with another popular Italian figure who spent his life spreading his faith before dying at a young age.Leo canonized Carlo Acutis, who died of Leukemia in 2006, and Italian student and avid outdoorsman Pier Giorgio Frassati, who died in his early 20s of polio in 1925, during an open-air Mass in St. Peters Square before an estimated 80,000 people.Leo said both saints created "masterpieces" out of their lives by dedicating them to God."The greatest risk in life is to waste it outside of Gods plan," Leo said in his Sunday homily. The new saints "are an invitation to all of us, especially young people, not to squander our lives, but to direct them upwards and make them masterpieces."POPE FRANCIS KICKS OFF HOLY YEAR AT VATICAN WITH OVER 32 MILLION VISITORS EXPECTEDAcutis was born on May 3, 1991, and earned the nickname "Gods Influencer" after creating a multilingual website documenting so-called Eucharistic miracles recognized by the church. The teen finished the site at a time when such projects were typically in the realm of professionals.In October 2006, Acutis fell ill and was diagnosed with acute leukemia. He died within days at just 15 years old. He was entombed in Assisi.Pope Francis fervently willed the Acutis sainthood case forward convinced that the church needed someone like him to attract young Catholics to the faith while addressing the promises and perils of the digital age.Leo inherited the Acutis cause, but he, too, has pointed to technology especiallyartificial intelligence as one of the main challenges facing humanity.LGBTQ CATHOLICS MARCH THROUGH ST. PETERS BASILICA IN JUBILEE RITE AS VATICAN CALENDAR ENTRY STIRS CONTROVERSYFrassati, the other saint canonized, was a "beacon for lay spirituality," Leo said.Frassati lived his faith through "constant, humble, mostly hidden service to the poorest of Turin," noted theFrassati Catholic Academy. "He lived simply and gave away food, money or anything that anyone asked of him."It is believed that he contracted polio from those he ministered to in the slums of Turin, Italy, before his death.Fox News Digitals Ashley J. DiMella and the Associated Press contributed to this report.