The thing is, if you believe Jesus, in the Incarnation, there is nowhere else to be except in the Catholic Church, which is what this convert is saying:
My longing to become a Catholic boils down to the fact that I believe that the Bible is the Word of God and I take Christ at his word when he says to St. Peter,
‘thou art Peter and upon this rock I will build my church, and the gates of hell shall not prevail against it. And I will give to thee the keys to the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose on earth it shall be loosed also in heaven” Mt 16: 18-19.So if Jesus says He is building a church on St. Peter there is no other church that fits the bill. Either that or this verse means nothing, therefore the Bible means nothing (it cannot be the Word of God) and Jesus cannot be whom He claimed to be, etc. Either Jesus is God, the Christ, the Second person of the Trinity, and He keeps His promises and the Word of God means something (everything) and has to be taken seriously or it is all a load of rubbish, as Jesus said, ‘a house divided upon itself cannot stand’.