Many of us have different ideas on what the purpose of the Church is. This lack of unity makes the Church less effective.
Moreover, we are often more concerned about maintaining our communities than going out as fishers of men.
Then, many of us think that the laity are part of the hierarchy and should wait for orders from the clergy. The truth is that the laity should take the initiative to bring the Good News to the world.
Finally, there is a serious split between faith and life. We often think that our "secular" life and our "religious" life should be kept separate. In reality, faith should help us live better, while our daily life should serve as opportunities to live our faith.