On the contrary, the Churches have grown apart considerably in 1000 years. For example, the Roman Catholic Church allows rap music type of chanting, whereas the Orthodox church keeps to the more traditional forms of liturgy and chanting. Further the fasting in the Orthodox churches is much more emphasized than in the Catholic Churches. For example, I don’t think that Catholics keep the Fast of the Holy Apostles, Orthodox are asked to fast every Wednesday and Friday and the Communion fast is that and no food or drink from midnight.
So you think fasting and musical disciplines are essential to the Faith? Strange…
The Orthodox claim adherence to the apostolic faith, and they do, as Catholics do. But when this means a strict emphasis on the 4th-11th centuries — when the Byzantine style and spirituality flourished — I must disagree.
Eastern Orthodoxy feels different and ancient (and refreshingly so) because it mostly sticks to this time period. But it is wrong to equate this ancient time period with the essential faith and practice of the Apostles, which preceded the Byzantine mode by a few centuries.
The Catholic Church has continued to develop in relation to different cultures and ages, especially thanks to the teaching office (magisterium) and shepherding role centered in Rome.
Again, that is not to say the Orthodox approach is wrong. But people often get the wrong impression that the Orthodox distinctiveness means faithfulness to Apostolic Tradition, when really it just means adherence to a certain liturgical, artistic, and spiritual patrimony that really hasn’t developed since late antiquity.
For example, the Eastern style of icons is indeed ancient. But it would be wrong to think a certain artistic tradition equates to the faith of the Apostles. It is doubtful the first generation of Christians even venerated icons or used them in worship.
Or again, the liturgy of John Chrysostom is beautiful, but there was a time when even that liturgy wasn’t celebrated by Christians.
It is my view that we have grown closer in several respects, one of which is cease being petty about trivial things that shouldn’t divide us — like whether we use leavened or unleavened bread.