Contemporary debates surrounding transgender identity often frame gender variance as a modern phenomenon incompatible with the Abrahamic traditions. However, historical and textual evidence from Christianity, Judaism, and Islam demonstrates that gender diversity has long existed within these faiths, sometimes accommodated legally, sometimes interpreted symbolically, and in certain Christian contexts even canonised. This study examines theological anthropology and historical sources to assess how gender-variant individuals were understood within late antique Christianity, rabbinic Judaism, and classical Islamic jurisprudence. Special attention is given to early Christian monastic hagiographies describing figures such as Eugenia of Rome, Marina the Monk, and Euphrosyne of Alexandria, whose lives included sustained social gender transition and whose narratives were preserved in ecclesial tradition. Drawing upon primary sources and contemporary scholarship in theology, patristics, rabbinics, and Islamic law, this article argues that while modern transgender categories cannot be simplistically retrojected onto ancient figures, gender variance has never been absent from Abrahamic religious history. Moreover, early Christian ascetic theology created conceptual space in which crossing gender categories could be interpreted as spiritually meaningful rather than morally transgressive. The existence of such traditions challenges claims that transgender identity is wholly foreign to faith and invites renewed theological reflection in 2026 and beyond.