Catholicism has done the most amount than any other church to foster Christian unity. As a mark of our universality, we encourage all traditions and liturgical customs to flourish. In the Eastern Catholic churches, for example, there have been many saints that lived as faithful sons and daughters of God and the one true Church during their time on Earth. Great spiritual and liturgical practices have sprung from such great saints. Similar to this is also the case with the traditions of the Anglican Ordinariate (who are in full communion with the Catholic Church). This is catholicity and unity.
https://www.youtube.com/watch?v=Hi5YgbiNB1USt. Augustine, Letter 54 to Januarius
>There are other things, however, which are different in different places and countries: e.g., some fast on Saturday, others do not; some partake daily of the body and blood of Christ, others receive it on stated days: in some places no day passes without the sacrifice being offered; in others it is only on Saturday and the Lord's day, or it may be only on the Lord's day. In regard to these and all other variable observances which may be met anywhere, one is at liberty to comply with them or not as he chooses; and there is no better rule for the wise and serious Christian in this matter, than to conform to the practice which he finds prevailing in the Church to which it may be his lot to come. For such a custom, if it is clearly not contrary to the faith nor to sound morality, is to be held as a thing indifferent, and ought to be observed for the sake of fellowship with those among whom we live.All of this is truly that of the early Church and why Catholicism remains to be the one true religion for there exists no other Church that accomplished this to such a great extent.
Eastern Catholic Divine Liturgy
https://www.youtube.com/watch?v=YuKTk5qLM4k 