The Bible tells us that Adam sinned, so are you saying the Bible is wrong ? ... I just provided scripture ... I didn't give any opinion of my own in that post.
When Adam sinned, sin entered the world. Adam’s sin brought death, so death spread to everyone, for everyone sinned. 13Yes, people sinned even before the law was given. But it was not counted as sin because there was not yet any law to break. 14 Still, everyone died—from the time of Adam to the time of Moses—even those who did not disobey an explicit commandment of God, as Adam did. Now Adam is a symbol, a representation of Christ, who was yet to come. 15 But there is a great difference between Adam’s sin and God’s gracious gift. For the sin of this one man, Adam, brought death to many. But even greater is God’s wonderful grace and his gift of forgiveness to many through this other man, Jesus Christ. 16 And the result of God’s gracious gift is very different from the result of that one man’s sin. For Adam’s sin led to condemnation, but God’s free gift leads to our being made right with God, even though we are guilty of many sins. 17 For the sin of this one man, Adam, caused death to rule over many. But even greater is God’s wonderful grace and his gift of righteousness, for all who receive it will live in triumph over sin and death through this one man, Jesus Christ. 18 Yes, Adam’s one sin brings condemnation for everyone, but Christ’s one act of righteousness brings a right relationship with God and new life for everyone. 19 Because one person disobeyed God, many became sinners. But because one other person obeyed God, many will be made righteous. 20 God’s law was given so that all people could see how sinful they were. But as people sinned more and more, God’s wonderful grace became more abundant. Romans 5:12-21