At the time of the Reformation in the sixteenth century, the Anabaptists sought to find a full Biblical resolution to the changes that were being made in the church.
Anabaptists believe that in order to receive baptism, a person must have come to a personal faith, i.e. they do not believe that infant baptisms are valid. They believe that to be a Christian you have to both have faith and live a life of discipleship. Anabaptists believe that because the church is an eternal work of God, it cannot be identified with any state-sponsored institution. As a corollary to this attitude of separateness from temporal authority, Anabaptists do not serve in government office or in the police force or armed forces of any nation. Read more about Anabaptism here.