With all due respect to you, I think a great deal of what I perceive as a Baha'i stategy is a continuous attempt to destabilize other people's faith by questioning the more "fantastic" elements of all faiths except their own, wih interludes of "oh, I really appreciate your faith, what you believe is also in my religion ... but only at my own terms and conditions". If an atheist wants to discuss whether certain religious figures existed, I can see the point because many atheists believe in "hard evidence only" and for many of them, beliefs that are not backed up by hard evidence are questionable, to say it politely. I don't agree with the atheist line of argumentation, but I can understand where it comes from.
With the Baha'is its a little different. They want to proselityze others to give up one "superstitious" religious belief (yours) for another "superstitious" belief (theirs).As many people with a Biblical belief for example are mostly required to believe the events of the Bible as facts, the Baha'i faith is probably is very well documented and "backed up by facts" because it's only around 150 years old. So there is much more "evidence" for the existence of Baha'ullah then, let's say Jesus, who lived 2000 years ago, or Krishna, who is said to have lived some 5000 years ago. The more you go into the past, the more possible evidence changes into myths and lore.
Now, do I believe that Krishna existed? As the origins of the Krishna myth are around 5000 years ago, it becomes impossible to tell. However, science acknowledges the existence of a Yadu dynasty, scientists claim to have found the ruins of a city which could have been Dwarka, and there seems to have been some actual military conflict which was later narrated as the Mahabharata war. This seems as close as it gets with regard to facts concerning Krishna, and actually these facts are not relevant to my faith. I know that the Krishna myth blends together at least who different myths, an older one about a warrior prince and diplomat, and a younger other one about a sassy village boy/possible fertlity god tending cows. I don't believe that somebody from a farmer's background could have made it successfully to a war strategist and diplomat in real life. Does that mean that the teachings and the bhakti approch that comes with it are irrelevant to his followers? At least not for me. I can even accept the fact that a literal Krishna could have been nothing but the brainchild of a seer or talented author long time ago.
However, if a possible origin of one "superstitious belief" (in this case, Hinduism), is questioned in order to validate another "superstitious belief" (in this case, Baha'i faith), which as well could be nothing but the brainchild of a seer or talented author some 150 years ago, just because the latter is much younger and therefore has much more "evidence", I'm not playing this game. Many Baha'is on this forum raise questions not because they want an actual discussion, but into share with others the latest gospel, the one of Baha'ullah, at some point or another, because that's what their faith seems to require them to do. As the lore about Krishna (Jesus, Zarathustra, Mohammed, Buddha) is too old to get any "hard evidence" for the existence of these people, most Baha'is consider these religions to be "outdated". How convenient they have a "modern" one for you, and if you object to this strategy, then you are "intolerant" or "against progress".
I know that for atheists/agnostics, the question of authoritativeness of a religion may be ridiculous. But for those who believe in God(s), such questions often touch the heart of what they believe. If a religion promoting itself as the paragon of "interfaith" and "religious tolerance" utilizes a strategy which may hurt the religious feelings of others, I question the integrity and the veracity of said religion to actually promote "religious tolerance" and "interfaith".