The Churching of Women in the Christian Church after Child-Birth had nothing to do with 'uncleaness' or "sinning"
In the Catholic Church the Churching of Women is a a blessing given by the Church to mothers after recovery from childbirth. Only a Catholic woman who has given birth to a child in legitimate wedlock, provided she has not allowed the child to be baptized outside the Catholic Church, is entitled to it. It is not a precept, but a pious and praiseworthy custom
In the Church of England The Churching of Women was the common name for the Thanksgiving of Women After Child-Birth.
The Book of Common Prayer:-
The Woman, at the usual time after her Delivery, shall come into the Church decently apparelled, and there shall kneel down in some convenient place, as hath been accustomed, or as the Ordinary shall direct: And then the Priest shall say unto her,
FOR AS MUCH as it hath pleased Almighty God of his goodness to give you safe deliverance, and hath preserved you in the great danger of Child-birth: you shall therefore give hearty thanks unto God, and say,
(Then shall the Priest say the 116th
Psalm.)...............................................
............................Minister. Let us pray.
ALMIGHTY God, we give thee humble thanks for that thou hast vouchsafed to deliver this woman thy servant from the great pain and peril of Child-birth: Grant, we beseech thee, most merciful Father, that she, through thy help, may both faithfully live, and walk according to thy will, in this life present; and also may be partaker of everlasting glory in the life to come; through Jesus Christ our Lord. Amen.
Stan