This book examines nonbinary thinking and Christianity in the late Roman Empire and the Middle Ages
An excerpt from ‘Humans: A Monstrous History’, by Surekha Davies.

Between late antiquity and the end of the Middle Ages (ca. 200–1400 CE), Christian scholars, theologians, jurists, and medical practitioners frequently drew on the Bible to think and write about nonbinary individuals. At stake was figuring out the limits of who counted as human – and, by extension, who got to go to heaven (sins permitting). The Book of Genesis contains a potential nonbinary individual at the start of human history: Adam.
God was said to have created Adam and then created Eve. According to some early versions of Genesis, God split Adam in half, using one of his sides to make Eve. In a translated version that became widespread, Eve was created from Adam’s rib (and was therefore, by implication, inferior to Adam). Either way, for some early Christian thinkers, Adam may have begun as a unified whole transcending the male/female division. Medieval science and gender historian Leah DeVun and other scholars of early Christianity call this idea “primal androgyny.”