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> The original human blood type was O (originating in Africa), then came A with the development of agriculture (originating in the Middle East, between 25000 and 15000 BC, and spreading west into Europe), then came B with the development of herding (originating in the western Himalayas, and spreading east into China and India, between 15000 and 10000 BC), then came AB with the fusion of A and B types, resulting from the first Mongol invasion of Europe by Attila the Hun. These are well established facts in anthropology.
Umm...quite an assertion. There are some assumptions here, followed by the assertion that there was no mixing between type A and type B individuals until the Mongol invasion(s).
But the assumptions are unproven, since there is no genetic evidence for it archeologically. And as for no mixing - that is highly unlikely. People were trading, traveling, and migrating between Europe and Asia WAY before 1000 AD.
Ergo, while it may be (probably is) true that the shroud of Turin is of later date, even IF the blood type on it is AB (and I don't recall were this is cited), it would not prove anything.