"In Christianity, even your BEST deeds are “mensural rags” before the Holiness of God" is not Biblical Christianity.
[Isaiah 64:6-7 NIV] 6 All of us have become like one who is unclean, and all our righteous acts are like
filthy rags; we all shrivel up like a leaf, and like the wind our sins sweep us away. 7 No one calls on your name or strives to lay hold of you; for you have hidden your face from us and have given us over to our sins.
H5708. עֵד ʻêd, ayd; from an unused root meaning to set a period (compare H5710, H5749); the menstrual flux (as periodical); by implication (in plural) soiling:—filthy.
H899. בֶּגֶד beged, behg'-ed; from H898; a covering, i.e. clothing
Applies to all ... [Romans 3:10-12]