I noticed a couple of typo's here so I corrected them for you Grissom
The only reasons that one is disfellowshipped is for one not having a Christian Watchtower attitude or heart.
It is not for or from a particular sin. But it is from one's reaction to that sin such as non-repentance what the Society has deemed sin, smoking, thinking, not accepting everthing they say as from the mouth of God.