Yes, you're right MM, and there was undeniably sufficient evidence at that time to conclude that the 1st century churches described in the epistles, were apostolic. But, during the subsequent centuries, I do not believe whatsoever, that the same testimony that substantiated the NT Churches' authenticity, can be said of any of the Churches that followed their expansion.
This is where the crux of my argument lies, we see nothing but an infiltration of wickedness and heresy in all churches, that not one of them can contend to be faithfully apostolic. I am not looking to be defiant or contentious, and I would be more than ecstatic to know that there was a place to go where the unadulterated truth has been preserved from Christ's time. But, sadly and somewhat discouragingly, there is just no evidence of that anywhere, not in its doctrinal entirety.
So, attempting to speak as objectively as possible, and not trying to be a renegade, I am left to trust only my own judgement based on the readings from the Bible. This does not preclude the desire or need to constantly consult other theologians and apologist's perspectives, on various subject matters of theology and from all denomination and countries. The latter part is mandatory, actually - no one is an island.