Why is it so much easier to sin than follow Jesus? How is it possible, that it is harder to follow Jesus, than to sin? I really want to follow Jesus, and I'm trying to. But every day again I fail again, because short term desires which withdraw me from God and Jesus. 
How is it possible, that the devil can still catch my attention and make me sin? I pray each day again, and ask for Jesus to lead my way, the Holy Spirit to live in me, and the devil to leave my life.
Pious Christians tend to overlook a very simple truth about sin.   In the short term, it is fun.

And why is it fun?  Because as Jesus said (John 3:19):


  Men love darkness, rather than the light.


And why do men love darkness rather than light?  Solomon noted (Proverbs 14:12):


  There is a way that seems right to a man, but the end thereof is death


Simply put:


It is fun to be the one in charge.
It is fun to get your own way.
It is fun to experience sensations that are new - even if they are not what God intended.


But in the end, it's not worth it. 

Ultimately, all sin comes down to one question - Will you trust God or yourself?  And tell me - who wouldn't naturally - absent God's direct intervention - choose one's self?

The very first temptation that the Serpent told Eve was that the apple was good.


  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. 


In this, and this may be shocking - the Serpent did not lie.  He merely omitted the long term consequences.  In the short term, all sin seems to have a positive reinforcement.  

Ecclesiastes 8 says it well:


  11When the sentence for a crime is not quickly carried out, people’s hearts are filled with schemes to do wrong. 12Although a wicked person who commits a hundred crimes may live a long time, I know that it will go better with those who fear God, who are reverent before him. 13Yet because the wicked do not fear God, it will not go well with them, and their days will not lengthen like a shadow.


Finally, it should be understood that sin is not a defect of will - it is a defect of love.  John 14 15 says:


  If you love me, keep my comamndments.