If the job was done "perfectly", surely the message would be clear.
Obviously it is not clear because sincere, genuine, educated seekers-after
-truth study the very same texts and come up with thousands of different doctrines and beliefs.
There will be no 'doctrinal test' when we meet God. The only question that will matter is, 'did you truly know the Lord Jesus Christ and trust Him alone for salvation, did you receive the Holy Spirit, did this result in righteousness within you?'
Apart from the above all our differing doctrines and beliefs will be irrelevant.
You only have to examine the very differing views of the early and later fathers to see that this is so. Doctrine was so diverse among them that if 'correct doctrine' had been what was required few would have been saved. Were the Arians who gathered at the Council of Nicea bearing the broken limbs, signs of torture and many scars obtained because of their testimony to Jesus Christ all lost? I don't personally think so. If their HEARTS were true to Jesus Christ as their personal Saviour I do not think that God would overpress niceties of doctrine on a subject not fully understood.