[NYer]

... in 1054 the Christian Church was split by the tragic misunderstanding of the great schism where the West excommunicated the East, and the East excommunicated the West, giving rise to the division known today of Catholic and Orthodox.

With one exception: the Maronite Church. The Maronites remained faithful to the pope, declaring: "Where Peter is, there is the Church".

Ping!

[OneWingedShark]

One can look to the Scriptures to see that the Lord deliberately founded a living Church built on his Apostles in order that his teachings and sacraments would continue down through time.

This is wrong.
It is wrong because Jesus did not found his church on flesh and blood (the Apostles or Peter) but on Truth, namely a Spiritual truth, and in fact the biggest Truth there is:

(Matthew 16:15-18)
"But what about you?" he asked. "Who do you say I am?"

Simon Peter answered, "You are the Messiah, the Son of the living God."

Jesus replied, "Blessed are you, Simon son of Jonah, for this was not revealed to you by flesh and blood, but by my Father in heaven. And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it.

The rock that Jesus is referring to there isn't Peter, a flawed man who still would deny Jesus three times, but that Jesus is the Messiah, the Son of the Living God.

Peter's denial is actually quite relevant because Paul in 2 Tim 2:13 says If we are faithless, He remains faithful, for He cannot deny Himself. and if the Church were founded on Peter who denied Jesus then that would literally be part of the church's constitution — but it is not, it is that Jesus really is who he said he was and that, because of that, can do what he says he can.

[aMorePerfectUnion]

“How Many Catholic Churches Are There?”

23 official denominations of Catholic
millions of individual denominations of Catholic

[Rio]

one catholic and apostolic church

Seems like I've heard that somewhere before...

[Ann Archy]

Catholic means UNIVERSAL.....ONE TRUE CHURCH.....some “sects”.

[Secret Agent Man]

and if you are going by the definition of “catholic”, which means “universal”,as in the church universal, ie one, there is one church universal, made up of all believers.