Brazilian gospel singer Isaias Saad led the baptism, complete with musical backing, and was joined by Firmino, wife Lari and goalkeeper Allison.
"Jesus is love," Firmino said, standing in a swimming pool. [There is] no explanation. just believe it. Just believe and feel the holy spirit."
Firmino was embraced by Lari after his head was pulled from the water as Alisson appears to be immediately overcome by emotion.
Liverpool team-mate Fabinho can also be seen in the crowd watching.
— Laurie (@LFCLaurie) January 15, 2020