Jesus did not tell us that He would build a ‘static’ church, did He?
The Church of AD 33 was a church made up of men and women who had been mostly Jewish, Greek, or Roman, who were being persecuted by all around them, living when in Judea/Palestine in an ‘occupied’ country, then traveling around to territories in Asia Minor, where most people were not literate. . .where there were no churches to worship in and even to profess a belief in Christ could mean you would be taken and put to a gruesome death. . .
Many ‘externals’ of that church of AD 33 would not be ‘identical’ to today’s Catholic Church–nor indeed to any Protestant Church either. The Church was not meant to stay ‘stuck’ in a time warp; by the nature of preaching the gospel it was meant to grow. Growth will cause all kind of external change as would be expected. However, the internal church: Instituted by Christ, with the keys given to Peter and the Holy Spirit’s guidance to ‘all truth’ as promised by Christ–yes, that remains ‘as it was’ --the growth of the ‘body’ and the understanding brought about by external cultural changes (such as literacy, many areas of relative peace and security, etc.) have deepened the concepts as the Spirit has given us knowledge to understand that deepening–but the core–which is Christ, and thus unchanging and for all ages–remains the same.