Claim to be the only true church and way to salvation?

Q - I get hurt and offended when some of my Jesus-believing friends from Church X claim that their congregation is the only true church and they are the only ones who would be saved. They claim that throughout history, their church had always been directly connected with the "correct" prophet and with Jesus. What do you think of this claim to be the only true church and way to salvation?

A - 1. That claim contradicts Acts 16:30-31 [(CEV) 30 After he had led them out of the jail, he asked, “What must I do to be saved?” 31 They replied, “Have faith in the Lord Jesus and you will be saved! This is also true for everyone who lives in your home."] that says BELIEVING in Jesus saves; there is no mention of the need to join Church X. And besides, Church X as a formal congregation like it is now, did not exist then. So how could the first-century believers join it?
John 1:12 (CEV) Yet some people accepted him and put their faith in him.So he gave them the right to be the children of God.
Agai, this says faith in Jesus, not formal membership in Church X, saves.

2. It is technically impossible to historically prove a direct, unbroken, organizational, formal connection of any church to the historical Jesus. The history of the first 300 years of Christianity is especially challenging as it was characterized by chaos, frenzy and even violent claims and counter claims, and fierce and often destructive competetion among various sects, not to mention political meddling from many earthly powers. RIGHT FROM THE BEGINNING, THERE WAS not ONLY one CHRISTIANITY; THERE WERE many CHRISTIANITIES. Some present-day sects could have some roots from those early Christianities, but there are many such claims and claimants. Meanwhile, there are some congregations that were born/founded only yesterday, far removed from the historical Jesus by time and space, but ALSO claim to be the only true church, the only ark of safety, the only way to salvation!
Such fantastic claims, upon close, scholarly and objective study of those who are learned and trained in historiography and research methods, would fall by the wayside. Sadly, most believers of these claims are that: BELIEVERS. They do not make independent, objective, disciplined and scientific study of historical documents; they only swallow what their local, self-promoting pulpits teach them --- and what their ears love to hear!

3. The doctrine of "only one true church" empowers, validates and promotes only one group and disempowers all others. Groups that believe in this idea naturally also claim to own God and Heaven as belonging to them only. The other problem with the idea of being "the only true church" is that many other groups, Christian or not, could also claim it for themselves, stake exclusive access to and blessing from God and assign to themsleves sole citizenship in heaven.

There are people who would not be happy being children of God among many; they need to be the ONLY legitimate children of the Divine. They would not be happy just being "saved"; they need to be the ONLY ONES who are saved. They are not happy just being correct; they need for everyone else to be wrong. It would be interesting to study the psychological make-up of such people.

Usually, this exclusive "privilege and right" makes them feel proud and superior, even gloating at their self-convinced belief that everyone else outside of their church would fry in hell.
Misguided, self-centered, bigoted, narrow-minded religiosity could really be dangerous.
God is BIG, heaven is BIG and the love of God is Great! Surely, God in his infinite wisdom and love would not be happy to be surrounded only by such self-promoting, self-righteus, judgmental, exclusive-club people in all eternity! Afterall, Jesus came not for the "righteous" but for the "unrighteous"!