A prayer rally planned for King George Square two days before Brisbane goes to polls suggests the emotive issue of same-sex marriage will continue to dominate the political agenda.

Outspoken Sydney Christian Democratic Party candidate Peter Madden will spearhead the Queensland election prayer rally tour, a mobile protest driven by a truck emblazoned with anti-ALP and anti-homosexual advertising.

The tour will see prayer rallies held in Taree, Kempsey, Casino, Lismore, Gold Coast and Sunshine Coast before culminating in Brisbane on March 22 and will focus on removing “the ungodly from power”, Mr Madden said in a media statement.

Queensland equal rights advocate Phil Browne said the tour was "derogatory and offensive to most Queenslanders” and likened it to the vilification of Jews or women.

Mr Browne called on Brisbane Lord Mayor Graham Quirk to cancel the rally to show Brisbane was "a fair and tolerant progressive city".

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A spokesman for Cr Quirk said people had a right to protest and Brisbane City Council would not engage in censorship.

He said the council would only step in "if there were concerns over whether the group would be breaking any public laws".