The expected response to the question, "What was the beginning of sin", is probably when Adam and Eve at that apple. Actually, no. The Bible does not say apple, that's a bit of information for you to carry around and shine up to show people on occasion. In addition, Eve was deceived by the serpent, which was the work of Satan. For some reason, Adam chose to eat the fruit that she gave to him. Interesting to note that if Eve had been presuppositional in her approach, she would have stopped the whole thing right there by declaring that she believed God, not Satan.
If you study on it, you'll realize that the first sin was not with Adam and Eve. Instead, it was when Lucifer rebelled against God because of pride. Before that, everything was very good (Gen 1:31). This raises questions and can give material for a passel of sermons and articles, so we have to keep the subject narrow. Satan fell because of pride, and has appealed to the pride in humans to make us stumble since that day in Eden.
God the Son, our Creator (Col. 1:16, John 1:1-3), took on the form of a man to redeem us. He didn't have to, but he did so out of mercy and love. Our fallen nature prompts us to try to save ourselves, to earn our salvation, which is a gift of God (Eph. 2:8-9). We can't earn it or save ourselves, old son. We have to humble ourselves before him and receive salvation.
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