what we have to ask is would God have allowed Mary to have become estranged from him? The not so logical logic of the argument that Mary was disposed to sin, allows for the possibility that Mary could sin, even in excess and still parent the Son of God..don't you think that's a little odd? If she were only the 'carriage' of Jesus physical birth and raised him exposed to her personal sin, would that be the will of God, do you think? This is the Mother of our Lord and Saviour...if you believe that Mary sinned, then you must also accept that she could have been moderately sinful as easily as you accept that she may be minimally sinful, yes ? With this argument you accept that Jesus could have been raised in a sinful household, and possibly, a very sinful household, is that also correct?
now the passages that you referred to in your post ;
Luk 2:22 And after the days of her purification, according to the law of Moses, were accomplished, they carried him to Jerusalem, to present him to the Lord:
Luk 2:23 As it is written in the law of the Lord: Every male opening the womb shall be called holy to the Lord:
Luk 2:24 And to offer a sacrifice, according as it is written in the law of the Lord, a pair of turtledoves or two young pigeons:
and
Lev 12:1 And the Lord spoke to Moses, saying:
Lev 12:2 Speak to the children of Israel, and thou shalt say to them: If a woman having received seed shall bear a man child, she shall be unclean seven days, according to the days of separation of her flowers.
Lev 12:3 And on the eighth day the infant shall be circumcised:
Lev 12:4 But she shall remain three and thirty days in the blood of her purification. She shall touch no holy thing: neither shall she enter into the sanctuary, until the days of her purification, be fulfilled.
Lev 12:5 But if she shall bear a maid child, she shall be unclean two weeks, according to the custom of her monthly courses. And she shall remain in the blood of her purification sixty-six days.
Lev 12:6 And when the days of her purification are expired, for a son, or for a daughter, she shall bring to the door of the tabernacle of the testimony, a lamb of a year old for a holocaust, and a young pigeon or a turtle for sin: and shall deliver them to the priest.
Lev 12:7 Who shall offer them before the Lord, and shall pray for her: and so she shall be cleansed from the issue of her blood. This is the law for her that beareth a man child or a maid child.
Lev 12:8 And if her hand find not sufficiency, and she is not able to offer a lamb, she shall take two turtles, or two young pigeons, one for a holocaust, and another for sin: and the priest shall pray for her, and so she shall be cleansed.
Do you understand how illogical the question is based upon these passages of scripture....Mary was rendered sinless and was obeying Mosaic Law of the time, no command had been issued for her not to fulfill the expected purification process and being the dutiful person that she was, she obeyed the law. Mary's submission to the law had nothing to do with her need for purification and everything to do with her humility and obedience.
Jam 4:6 But he giveth greater grace. Wherefore he saith: God resisteth the proud and giveth grace to the humble.
Logical Fallacy, could you tell me why Jesus (being without sin) submitted to the purification practice of Circumcision. Jesus was intrinsically and infinately holy, why would he obey laws of the old covenant to be purified?