The man wearing a tracksuit top and shorts was pushed to the ground and handcuffed by cops at St Michaels church in Belfield, where Mark Latham was speaking.
Police recommended cancelling the engagement when more than 100 Christian Lives Matter followers clashed with about 15 LGBTQ protesters, but the speech went ahead.
Far-right Christian men set upon and attacked LGBTQI activists outside a church where One Nation MLC Mark Latham was due to give a speech in the southwest Sydney suburb of Belfield on Tuesday evening.