Most of the issues I've described here come from later interpretations, not from His own pen. Therein lies the problem. With the Covenant, Baha'u'llah made it very clear that Abdu'l-Baha' was his successor, and that what he said was authoritative; and then it passed to the Guardian, and so on down to the Universal House of Justice. To believe in the authority of some of these institutions and not others is to break the Covenant, which is emotionally impossible for me. It's also illogical. I don't see how I can believe that Baha'u'llah was who He said He was, and yet discount what He clearly said about the succession of His authority.
That leaves two choices: I accept all of it, or I accept none of it.
Now you know what I have to do. Since I can't make myself accept all of it anymore, I feel like I have no choice but to resign my membership in the Baha'i Faith.