well Eve blamed the devil. She was honest about being beguiled But Adam was told by God about the forbidden fruit, not Eve, so he deliberately disobeyed God AND blamed God. Eve, being beguiled, had only Adam's word to go on not God. It was adams sin that fell on mankind because he wasn't protecting her or stopping her.
Read Genesis again.
Notice Eve talked to the serpent and quoted what Adam had said to her, but when she gave Adam the fruit he didn't say a thing! He just ate it. He wasn't listening to God, he was listening to Eve.
Why should Eve's desire be for her husband, that he should rule over her? And her conception and sorrows be multiplied? Well think about it. If God hadn't had that happen - Eve would have kicked Adam to the curb, and lived on her own, and not have any children at all.
And Adam wouldn't have had to work for a living to provide for his children.
If Adam and Eve had followed God originally, Abel may not have been killed. Cain's line was ungodly, Seth, who was born to replace Abel, was the godly line who called upon the Lord. And ever since, there's been good and evil. Remember God's mercy in that he spared Cain. He could have smote him there and then.