At Guardian Australia’s Why Knot? event, campaigners told how the battle for marriage equality can be won if gay and straight supporters alike go out and spread the word about their own experience. Bridie Jabour and Miles Martignoni look back at some of the most moving speeches from Benjamin Law, Ally Hocking Howe, Kristina Keneally and Rodney Croome, and ask what role religious faith will play in the debate