Sorry "Retired History Teacher" your answer has no medical background neither does your education.
Lutheran Blood types do exist. It is because of the presence of a very rare antigen called the "Lutheran Antigen". It effects less than .003% of the population and it's very very rare. I've only seen it twice in my long career as a paramedic/emergency room tech.
Sometimes things that are named like a religion has nothing to do with a religion. In this case it does not. I have no idea how it got the name Lutheran antigens but they do exist... and a simple Google search before you posted would have proven this. It probably has something to do with the LU gene in the human DNA code.
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No such thing. There is 0 negative blood, but blood doesn't come in religious types. Religion is an idea. Blood is physical.