Christian unity is urgent. The divisions among Christ's people are a scandal.
Read Pope John Paul II's encyclical on Christian unity 'Ut Unum Sint' (That They May Be One).
There's also a very interesting 1994 document produced by Catholic and Evangelical leaders and scholars Evangelicals and Catholics Together
A Vatican document has this to say about Ecumenism on campus
Finally, try this - Salvation: by faith or works?