While that's a bit of truth worth hanging on to, one of the songs in that film speaks some different words of truth that deserve some notice as well. The gypsy, Esmerelda, is taking sanctuary in the cathedral and sings of the plight of her people and others who are rejected by society.
While there is a discussion to be had about whether "we all [are] the children of God," my heart can't help but to beat in time with Esmerelda's desire for God's blessings on those who are ignored or abandoned by the looking-out-for-number-one masses.
Truth is...When Esmerelda asks "Were You once an outcast, too?", the answer is a definite "Yes." Jesus was an outcast, and he understands. ("He was despised and rejected by men; a man of sorrows and familiar with suffering. Like one from whom men hide their faces, he was despised, and we esteemed him not." - Isaiah 53:3 NIV)