What do you think must be done to accomplish unity between Catholics and Protestants?
You know that's almost identical to a question asked in the YouCat? Which means I get to copy the answer for you, since it's perfect. :-)
In word and deed we must obey Christ, who expressly wills "that they may all be one" (John 17:21).
Christian unity is the business of all Christians, regardless of how young or old they are. Unity was one of Jesus' primary concerns. He prayed to the Father "that they may all be one ... so that the world may believe that you have sent me" (John 17:21).
Divisions are like wounds on the Body of Christ; they hurt and fester. Divisions lead to enmities and weaken the faith and credibility of Christians. Overcoming the scandal of separation requires the conversion of all concerned but also knowledge of one's faith convictions, dialogues with others, and especially prayer in common, and collaboration among Christians in serving mankind. Those in authority in the Church must not let the theological dialogue be interrupted.
May God bless you!
- Father Shane