If ALL Christians from all the churches would take to heart John 17, it would open the eyes of all and help bring that much needed UNITY.
22 The glory that you have given me I have given to them, that they may be one even as we are one, 23 I in them and you in me, that they may become perfectly one, so that the world may know that you sent me and loved them even as you loved me.
The only Unity for Christians is in His Word/Truth. The only earthly location for that Word is in Scripture.
All true believers having been indwelt by the Holy Spirit understand John 17. Its exactly what we have been trying to impress on those who follow the errors of the Catholic Church. Its time for those believers to leave that apostate organization lest they partake in her plagues.