The idea is that Adam was both Male and Female before Adam split into Adam and Eve. This is also related to Plato’s idea’s of a perfect form for each creature. The perfect form of the neoplatonists combined genders.

Millenerian groups inspired by Kabbala believed that the Gender Binary would be healed by the rapture. They saw their gender explorations as hastening the return of Jesus.

Gender in Mystical and Occult Thought: Behmenism and Its Development in England‎
	Brian J. Gibbons - 2003