What does Frankie's birth in a church represent?

Frankie's birth in a church symbolizes his saint-like persona. The religious implication of being born in a church is obvious, but his origin story is even more miraculous; he is born amidst carnage and yet he stays impossibly quiet. He is born under the auspices of the church's patron saint. The Spirit of Music implies that the church's saint himself created noise to save Frankie from ruin. Along with Frankie's extraordinary life and the gift of his magical strings, his birth proves he was put on the earth for the purpose to save people with his music.