For the record, the text of Genesis 3:15 mentioned above is found that way only in the Catholic [Douay-Rheims] version of the Bible. Other versions agree with the original Hebrew text in that the seed of the woman (Jesus) will do the crushing. The Catholic Church has changed scripture to fit with their doctrines. This tactic is the only way the Catholic Church can justify many of its teachings that are unbiblical.
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[To their credit, Catholic scholars have corrected this error in the Roman Catholic New American Bible.]