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Unbeliever (Write Back, August 30) is mistaken in thinking that there were only five people in the first human family.
Adam and Eve had many sons and daughters (Genesis 5:4), so Cain's wife must have been one of his sisters.
This need not shock us because, in the first generation, there would have been no alternative but to marry within the family.
Even Abraham, who lived centuries after Cain, married his half sister (Genesis 20:12).
But because too much close intermarriage would have weakened the human race, a law forbidding the marriage of near relatives was introduced later.
The New Testament confirms that 'from one man God made every nation of men that they should inhabit the whole earth' (Acts 17:26).
J Montgomery, Newtownabbey
