I've been arguing with Baha'is for years now. One of my main complaints is their claim of who are these "manifestation/messengers" that supposedly told us all we can know about God. The messages are inconsistent.
Messengers of God are as follows: Abraham, Krishna, Moses, Noah, Zoroaster, Buddha, Christ, Muhammad, the Bab and Baha’u’llah.? Baha'is have to search deep into Buddhist Scripture to find anything about a God. In the Hindu Scriptures they do use, the ones that mention Krishna, yes, a God is mentioned... and Krishna is an incarnation of that God. But Baha'is don't believe that. And I don't know where they get any Scriptures that make Abraham or Moses or any other person from Judaism fit into the Baha'i definition of a "manifestation of God"... a special creation... like a perfectly polished mirror that reflects God. The stories told about Jesus come close to that definition, but who else?
But it's their beliefs. It is what their religion tells them is true, and they have convinced themselves that what their religion teaches is The Truth. It's hard for any argument to change what they've committed themselves to believe.
My other problem with most any "organized" religion, of which I think the Baha'i Faith is one, is just how committed are the followers to actually do the things that their religion tells them to do? Do they reflect these supposed attributes of their God? Do Baha'i sound like they are loving, kind, just, and humble? Or do they sound like they have dogmas, doctrines, beliefs or whatever they want to call them? Yet the teachings they are supposed to put into practice... those teaching get ignored way too often. And I understand that. They're just human.
Unfortunately, because they can't put their own teachings into practice very well, it makes their religion look very "human" as well.... Too much talk and not very much action. Like many Christian Churches, too many people sitting there just going through the motions of being a believer.