The Bible, or what most Christians of any denomination consider Scripture, consists of both the Old and New Testaments. Without an organization with sufficient authority to rule on the canon of the NT, we would have only the OT now.
Only the Catholic Church existed at the time, and just as the Apostles went through a process of discernment of issues, which some might call FIGHTing, so was there discussion about which books should be included in the NT. The Apostles, and by definition their spiritual descendants, were given the authority by Christ to bind and loose to make decisions such as this.
There has been an Ekklesia from the Day of Pentecost onward to today. That Ekklesia will be 'sorted' when the Rapture removes the Ekklesia. Many religious Christian wannabees will remain here on earth for the increasing hellish life of the seven years of Tribulation who were institutional Christians but not members of the Actual Church, the Ekklesia, the Body of Christ.
In the clouds meeting Jesus in the air (see 1 Thess 4:13-18) will be folks from many denominations, including catholiciism, but only members of the Body of Christ, The Body of believers, the Ekklesia establish the day of Pentecost, will be there in the clouds, then returning with Jesus to The Father's House.
Izzat so?
27 “He answered, ‘Then I beg you, father, send Lazarus to my family, 28 for I have five brothers. Let him warn them, so that they will not also come to this place of torment.’
29 “Abraham replied, ‘They have Moses and the Prophets; let them listen to them.’
30 “‘No, father Abraham,’ he said, ‘but if someone from the dead goes to them, they will repent.’
31 “He said to him, ‘If they do not listen to Moses and the Prophets, they will not be convinced even if someone rises from the dead.’”