A provocative Auckland church that regularly stirs opinions with its billboards is doing it again with one showing two women getting married.

As debate rages over the Marriage Equality Amendment Bill before Parliament, St Matthew-in-the-City will tomorrow unveil a billboard showing two women in bridal gowns atop a wedding cake.

The billboard states "we don't care who's on top".

Reverend Clay Nelson said it should come as "no surprise" that St Matthew's endorses the bill as it has a long history of supporting the LGBTQ community in both the church and society.

"Our question is why would any church not endorse two people making a loving commitment to each other?

"Through our billboard we are expressing our solidarity with the many Christians in many denominations who are calling on Members of Parliament to support Louisa Wall's bill."

In March the church unveiled a billboard showing a Facebook photo album with Jesus on the cross as the main image, which was "liked" by Judas Iscariot.

And in the lead-up to Christmas it ran a picture of the Virgin Mary with a shocked expression as she looks at the result of her pregnancy test.

Vicar Glynn Cardy said the church had long been involved with weddings, with about 80 to 90 couples exchanging their vows there annually.

"What is important is their willingness to commit themselves to each other, not their gender. 

"It is the joy and risk of giving oneself to another in a bond of mutuality, fidelity and love that is at the heart of the sacrament of marriage."

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