Mr Cardy said Lent was a time of self reflection and sacrifice observed by Christians and Catholics in the lead-up to Easter, and the statue is aimed at bringing "the fallen" back to church.
The 2.13m artwork is a creation of local artist Nirmala Cooper, who said she wanted to create a sculpture that showed levity and gratitude at falling, but landing lightly.
"I want small children to walk around the fallen angel, to create a sense of awe (and) recognise that we can fall lightly," Ms Cooper said.
"Gadreel has elevated his torso as he lands on earth ... one wing is broken, his face shows surprise, but he knows who he is and remains an angel."
Paula Wilson, who was one of the first to see the statue at the central Auckland Anglican church, also became one of its first critics.
"It borders blasphemy to bring an enemy of God into the church to be honoured," she said.
St Matthew-in-the-City is known for its controversial depiction of Christianity. Last Christmas, it put up a billboard depicting Mary with a positive pregnancy test, and in 2009, another that depicted Mary and Joseph in bed with the text: "Poor Joseph, God was a hard act to follow".