is it possible that....

In the sense of the literal meaning of "the Church catholic" (ecclesia of Christ universal) as presented in Scriptures of the Bible, few Christian sects are a spin-off of the original first-century Church. You will be unable to show they all arose from the 'germ' of the RCC. We can only say the 'Protestant' churches (EOC, Methodist, Presbyterian, etc) were spin-offs of what is now known as the RCC, some thinking to revive and preserve the original beliefs with more-or-less accuracy. The present RCC is not representative of the nature of the first century Church, having constantly added elements with the continued self-claimed authority of canonization of scriptures not held holy before the spin-offs began. An example of that statement is their acceptance of the Apocrapha, which books were written hundreds of years after Christ, during which time Muhammad wrote the Quran with all its similar inaccuracies of history and contradictions against the Bible.Many so-called "Christian" sects are almost entirely based on obvious heresies arising from poor Bible exegesis, or beliefs apart from the Bible, such as Mormonism, based on supposed texts found in N. America claiming Jesus visited the area and began a new concept of the religion.Christian fellowships such as Baptist and Pentecostal, though diverse in some doctrines, both resulted from simple adherence to literal interpretations of Bible doctrines, not basing their beliefs on the Roman doctrines, though they independently adopted many common doctrines. Try obtaining a copy of "Trail of Blood" explaining how there always were groups of Believers from the beginning (Crucifixion of Christ onward) that resisted the waywardness of organized religion which tends to institutionalize simple belief into parcels of "men's traditions". There was much protest against the emerging Roman version long before there was a Pope in Rome.

Jesus "birthed" (began on earth what was out of Heaven) what was later called "Christianity" after people began calling followers of Christ's teachings "Christians" at Antioch.Because his disciples were unable to absorb and comprehend all Jesus had to teach, He sent back the Holy Spirit, who inspired those same disciples to say and write the many other things Jesus said would come later. The synoptic gospels (first 4 NT Books) recorded the actual contributions of Christ, his words and ministries. Paul (in his epistles) was the primary definer of Christian doctrine, independently harmonized with the writings of the other apostles. That Paul was converted then immediately separated from other Christians, having no contact with the apostles or their writings, yet coming out of his wilderness seclusion with doctrines not at all discordant with those of the original remaining 11 apostles, is very strong evidence of the inspired nature of his teachings. Paul was at least as equally inspired of the Spirit as Peter or John, as though Paul walked with Jesus a devoted disciple, not the avowed enemy of the sect of Christ, which he was many years until his conversion on the Damascus road.The seed of truth as taught by Christ is present in and the basis of all the doctrines of all the apostles. Those men simply added to what Christ delivered, carrying out the command of Christ to do so by the power of the Spirit sent to them at the Day of Pentecost.