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They don't KNOW. They BELIEVE because:

1) The Bible says she was a virgin when she conceived Jesus (most Christians)

2) Sacred tradition says she was a virgin her whole life (orthodox, roman catholic, and some Anglican christians)

Roman Catholics, Orthodox Christians, some Anglicans and a few other believe the Bible and Sacred Tradition are both divinely inspired.

Most protestants believe only that the bible is divinely inspired.

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12y ago
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Q: How do they know Mary was a virgin?
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