R
the sin was disobeying a direct command of God...though if you think about it that is what -all- sin really is...God says not to do something either through his word or through our conscience and we do it anyway...
in a way you could say that a lack of faith was also behind their sin...they trusted the serpent's lies and false promises more than they trusted God evidently...
in a way you could say that a lack of faith was also behind their sin...they trusted the serpent's lies and false promises more than they trusted God evidently...