What Catholics don't seem to understand is that the "early church" was the apostles. They and they alone are the group that Christ taught and who the Holy Spirit guided to record what was to be conveyed to subsequent generations. We see already in Acts 15 that there were those trying to add to what the apostles taught. It was the apostles and Paul alone who were taught by Christ yet we have Catholics and others trying to claim it's not good enough to rely on them alone.
People laugh at how a story told orally from person to person after time isn't even the same story but has changed and can't be trusted yet Catholics trust their eternal future on such story telling.
Catholics scoff at the idea of putting faith in Christ alone but put their faith in mere mortal men trusting that somehow that oral story telling didn't change. It makes no sense yet they trust those men with their eternal future.