I fully agree and from my own experience the only thing of Buddhas teachings I have found that I am unable to understand with my intellect that has to be taken on faith is the intricacies of karma.
Not karma itself for that is as simple of an action creates an effect, simply as clicking your finger makes a sound, it is just the intricacies and seeing how an action truly creates an effect that we are unable to understand for ourselves so we have to take faith in Buddhas teachings on morality.
if you understand the butterfly effect theory, you can understand how we can not know truly the effects of our actions. technically your breath could be an indirect cause for a typhoon that kills millions of people!
Again, the intricacies of karma are one of the imponderable things of Buddhas teachings.