Skeptics point out that Cain had no one to marry - therefore the Bible must be false. However, the Bible states plainly that Adam and Eve had other sons and daughters. Cain married his sister.

Genesis 5:4 After Seth was born, Adam lived 800 years and had other sons and daughters.

The Bible is a History book, not a Science book, but it is remarkable that where the Bible touches on Science, not only is it correct, but the writer could not have possibly known what he was talking about! How did the writer know these scientific facts? It must have been revealed to him by the Creator of the universe.

The Bible is unlike ANY book ever written. It is, in fact, the Word of God.

Source: Eternal Productions