Appropriate gender behavior, for instance, was considered by many to be an essentially improper concern for Christians. ... The influential "Egyptian Gospel" emphasized again and again the necessity of terminating traditional patterns of sexuality, especially childbearing, and asserted that the Apocalypse would not occur until "the two [genders] become one, and man and woman are neither male nor female."
— Christianity, Social Tolerance, and Homosexuality by John Boswell (Page 158)
This was an interesting comparison to something I recall from Gender Reversals & Gender Cultures:
To the extent that generic human being is male, that is rational soul, every description of the Christian process of salvation is a form of gender crossing for women. To be saved in of a world of body, flesh, and sexuality to become an incorporeal, rational soul is to become symbolically male.