Let me answer the first part with a parable. A man had two sons. One sent
him for father's day a card printed by a professional and signed his name.
The other wrote his own card which took hours to draw and his own poem with
a very personal touch. Now tell me which would the father prefer. Abel gave
from the fatest, choicest lamb. Cain gave from mediocre fruit (grade B or
C). As for the church world thinking the sin was eating fruit that is far
from Jewish traditon which holds that the sin was disobedience to a command.
<<Why were men circumcised, and not their mouths?>>
See the various commentaries on Moses's speach impediment due to the hot
coals test and draw your own conclusions.
With blessings,
Richard (Rachamim) Pauli