So this belief is unique to the small and insignificant Baha'i faith, and not common to mankind at all, as you insinuate. For a faith that preaches harmony, you guys sure know how to insult other religions.
But how can the Bahai really insult other religions (as you call other traditions) if most of those traditions themselves differ among each other in their theories about avatars etc. anyway?
The Bahai theory is just one among many.
Every tradition believes that their own cosmology (or lack of it) is the best.
It is only the fact that Bahai believe that all people on the planet will one day accept or bow down to their Bahai vision which is peculiar to me.
They are in a certain way islamocentric just like the Christians are in a way judocentric.
The Indian people who are not Christian or Muslim are far removed from those islamocentric and judocentric ideas.
Especially where they base their viewpoints on deep spiritual and cosmological philosophies, the Bahai viewpoint seems very much out of touch and quite irrelevant.
But for Bahai's this will never be clear to them as they lack the knowledge to be able to compare the different paradigma's in any meaningful way.
The problem with universal ideologies is that they feel they have the final superior overview regarding the whole spectrum of other ideologies.
But who is qualified or capable of making the ultimate overview?