"Eve surely had a clear conscience when she ate of the forbidden fruit."
I am certainly surprised that you wrote this. According to EGW, this cannot be true because Eve was warned against leaving her husband’s side AND avoiding The Tree. Even a very young child knows when it is taught something is wrong and cannot have a “clear conscience” if they transgress. Eve was said to be much more intelligent than you and I and could not have had a “clear conscience”…unless you are claiming that she had a mental breakdown which would have rendered her incapable of normal thought and reason.
"God never left things just to the conscience of human beings."
Yes, yes, He has…especially before the coming of Christ. EGW, herself, wrote that there would be those in heaven that had never heard of Jesus. Who or what allowed them to make “righteous” choices if not for the Holy Spirit? The Holy Spirit was given to be our “conscience”. Yes, He gave laws but those never cover all human contingencies and that is why we still have the Holy Spirit/God (aka “conscience”).
"William Noel said that we don’t need the church…"
I don’t believe that everyone needs to be a member of an organized “church”. I don’t think that it is essential to my salvation…it may be to your’s but not everyone.
"And I trust the teaching of the apostles more than I trust the teaching of any human being today."
Fantastic. I also trust the Holy Spirit than I do any person’s “interpretation” of the “teachings of the apostles”.