2000 years of arguments and the "TRUTH" still is a matter of 'faith' and 'belief'.  

Those centuries ago Church councils have as much authority as you and I do discussing the same issue today.  

First Nicea, Second Nicea, First Constantinople, Ephesus, Chalcedon,  Second  Constantinople, Third  Constantinople.  That gets us from 325 AD to 787 AD.  

Just a bunch of ecclesiastical politicians with their own axes to grind each time.

And each of those were declared "Infallible"!  Right!

And that's before we get into the modern Councils.  

https://en.wikipedia.org/wiki/Ecumenical_council