American Katy Faust was raised by her lesbian mother and her partner and she now runs a blog called asktheBigot, which is fiercely opposed to gay marriage.
She became a Christian in high school and was concerned by the plight of children.
She is in Canberra to lobby the Federal Government against gay marriage and she told Lateline why.
“While my mother was a fantastic mother and most of what I do well as a mother myself I do because that’s how she parented me, she can’t be a father. Her partner, an incredible woman — both of these women have my heart — cannot be a father