Today is the feast of St Augustine of Canterbury.
We really know little about him. He is portrayed as converting England to Christianity, he did some of that but his important role was bringing England into communion with Rome, mainstream Christianity. England already contact with Christianity, especially in the west and the north through the Celtic Church.
It is easy for us to forget being a Catholic in communion with Peter is mainstream Christianity. Not only is that evident through sheer dint of numbers, a billion plus Catholics in communion with Peter. It is also pretty obvious from the texts of the Gospels that Peter is the Rock on which the wisest of men Christ built his Church, which would withstand the buffeting of storm and even the Power of Hell until the end of time. It is also obvious from the history of the Church that the centre of communion is the person of the Bishop of Rome.
Any contact with Christ is a good, Augustine knew that there was something better than the mere "good". The "best" for Augustine was communion with Peter, mainstream Christianity.