India, Sept. 7 -- On September 7, Carlo Acutis will be canonized as the first millennial saint in a ceremony led by Pope Leo XIV at St Peter's Basilica in the Vatican. Tens of thousands of worshippers are expected to attend the canonization of the Italian teenager, who died in 2006 at just 15 years old.

Known as "God's influencer," Acutis used his self-taught computing skills to spread the Catholic faith online. Using his family's small, old computer, he created a website cataloging more than 100 Eucharistic miracles worldwide that had been recognized by the church.

His use of the internet to publicize miracles drew young Catholics across the globe.

"He wanted to help people to discover their faith, to discover God, the love of God. An...