Why is Adam considered the original sinner? In the Biblical account, Eve is the first to eat the forbidden fruit. Yet still the blame gets put on Adam and later on in the Bible it states that sin entered the world through one man.

Why is Adam considered the original sinner?
Genesis 3:6 (NIV) reveals that Adam was with Eve when she took the fruit.  


  6 When the woman saw that the fruit of the tree was good for food and
  pleasing to the eye, and also desirable for gaining wisdom, she took
  some and ate it. She also gave some to her husband, who was with her,
  and he ate it.


Adam had the opportunity and authority to stop Eve from eating the fruit.  While maybe not the best reason, I believe Adam could be considered the original sinner, because he did not act within his power to stop the sin from occuring.

This is something to remember when you are watching someone you have authority over entering into sin.

I still believe Eve sinned, though.  1 Corinthians 8 indicates that even when another causes you to sin, you still own your own sin.


  1 Corinthians 8:9-13 NIV
   9 Be careful, however, that the exercise of your rights does not
  become a stumbling block to the weak. 10 For if someone with a weak
  conscience sees you, with all your knowledge, eating in an idol’s
  temple, won’t that person be emboldened to eat what is sacrificed to
  idols? 11 So this weak brother or sister, for whom Christ died, is
  destroyed by your knowledge. 12 When you sin against them in this way
  and wound their weak conscience, you sin against Christ. 13 Therefore,
  if what I eat causes my brother or sister to fall into sin, I will
  never eat meat again, so that I will not cause them to fall.


From a technical perspective, Adam did sin first since his sin was allowing Eve's sin.

Also, for more on causing others to sin:


  Matthew 18:6 NLT
  6 But if you cause one of these little ones who trusts in me to fall
  into sin, it would be better for you to have a large millstone tied
  around your neck and be drowned in the depths of the sea.