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If the teachings, requirements, and goals of the Militia of the Immaculata are not completely synchronized with Orthodox Christianity, does it then qualify as a sect within Christianity?
The teachings of the Militia Immaculata are entirely within permissibility of Catholic orthodoxy, and thus not a sect. Total consecration to Mary does not originate with the MI, but they promote it heavily and use their own particular formula. The concept traces its origin (at least in a form recognizable today to St. Louis de Monfort's True Devotion to the Blessed Virgin).
Catholic theology can at time delve into significant nuances with subtle distinctions, but nothing that the MI outlines fundamentally conflicts with the general Catholic understanding of the role of Mary in relationship to Christ.
Postscript:
The first from Genesis 3:15 where God in sentencing the serpent foretold to him: βShe will crush your head!β
Different manuscripts exist with different pronouns in the verse. Some have masculine (favored by Protestants) and some have feminine (used by Catholics). The Catholic Church does not deny the role of Christ in the crushing of the serpent as forecast in the protoevangelium (Genesis 3:15) but the Church does also see a foreshadowing of Mary's role.