I am a Christian whose vehicle is Catholicism. To put aside internal bickering would be a godsend.
I don't like this word. It tends to cover two different things, one good, the other bad. It is good and in the service of Christ to study the Holy Scripture, the teachings of the Fathers of the Church, the history of the Church, understand how different communities of faith interpret the scripture and what theologies they have. On that, so long as the Christiandom is divided there will not be an agreement, but it is still good that there is the knowledge of what the other side (or sides) teaches.
It is wholly unproductive to engage in propaganda, especially when the other side is misrepresented. In the case of the Catholic Church, this is the great service to mankind that the 1993 Catechism is: it has become a matter of finding or not finding something in the Catechism to dispel anti-Catholic myths.