For decades, conservative evangelicals and Trans-Exclusionary Radical Feminists (TERFs) have worked hand-in-hand to oppose trans liberation. But how did this alliance come about? What makes it tick? And how can trans people and allies respond?

This book, written by a transfeminist who is also an evangelical Christian, is a history and genealogy of reactionary ideas. Gender Heretics traces how a shared belief in the essential unity of the mind and the body, together with a common fear of 'dualist' or 'Gnostic' philosophies, first brought these groups into contact in the 1970s.

Morgan explores how theological arguments snaked their way from anti-trans feminist tracts into the everyday practices of evangelical churches today. She offers a hopeful way forward, advocating for a full recalibration of evangelical thought on gender identity and trans activism.