A sin is any wrong doing. Not all sins leads to death. A deliberate wrongdoing that is committed by one who has been given the knowledge of the truth is not forgivable.
Read scripture anyway you want, but the only way one will ever come to the truth is if he or she allows Jesus/Holy Spirit to teach them.
(1 Corinthians 2:10-16) “These are the very things that God has revealed to us through the Spirit, for the Spirit reaches the depts. Of everything, even the depths of God. After all, the depths of a man can only be known by his own spirit, not by any other man, and in the same way the depths of God can only be known by the Spirit of God. Now instead of the spirit of the world, we have received the Spirit that comes from God, to teach us to understand the gifts that he has given us. Therefore we teach, not in the way in which philosophy is taught, but in the way that the Spirit teaches us: we teach spiritual things spiritually. A spiritual man, on the other hand, is able to judge the value of everything and his own value in not to be judged by other men. As scripture says;’ who can know the mind of the Lord, so who can teach him?’ But we are those who have the mind of Christ.”
I know from God, and from experiencing forty years of being sin free that the power of God is much greater than Satan/sin.