One question for Christians

[Brakeman]

The leprosy bacteria is best banished by chants and bird blood, not by complicated sciencey anti-biotics.

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Why are you confounding spiritual cleansing with a biological cure? ..

13 And the Lord spoke to Moses and Aaron, saying: 2 “When a man has on the skin of his body a swelling, a scab, or a bright spot, and it becomes on the skin of his body like a leprous[a] sore, then he shall be brought to Aaron the priest or to one of his sons the priests. 3 The priest shall examine the sore on the skin of the body; and if the hair on the sore has turned white, and the sore appears to be deeper than the skin of his body, it is a leprous sore. Then the priest shall examine him, and pronounce him unclean.

Oooh! Taking things out of context are we?? I don't think "spiritual uncleanliness manifests itself in the form of "leprous sores" now does it?
Besides, in practical terms the priest is deciding if the man can com back from the exclusion of a leper colony or similar. Reading the whole story doesn't not lead one to believe the problem is a man's sin that caused him to be punished by leprosy does it? No, it appears to be a priest judging the man's health and trying to help him. Furthermore, it is obvious that the priests incorrectly thought that the leprosy was brought about by fungus or mold, hence their house cleaning instructions. Apologists have avoided this by separating the story mid-stream, which makes both of the non-nonsensical. FYI, leprosy is a bacterial infection and has nothing to do with anything spiritual. We know that today, in the third century or so bc, when the story was made up, they didn't know that.

In verse 15, the bible says this:
17 And any garment and any leather on which there is semen, it shall be washed with water, and be unclean until evening. So does this mean the garment has sinned and it needs "Spiritual Cleansing" as well?