The Babi Faith was a universal faith. Universality is not about social acceptance but about the truth. Mohammad spoke the words of God, so did Baha'U'llah. Neither lay claim to being God, yet both quote God directly. Abdul Baha, the authorised interpreter of the writings of Baha'U'llah, goes to great lengths to make it clear that a prophet such as Baha'U'llah, is not God, and is nothing more than the mirror off which God's light is reflected.
Languages change with time.
In the time of Christ, Son of God had the meaning of Prophet or mesenger, in our time, Manifestation of God, is the most appropriate term to describe this is in all these entirely different languages in entirely different times. Proof is in the everchanging word for toilet in the English Language. In some parts of America, words like toilet, latrine, bathroom, etc. replaced one another in rapid succession as society evolved and changed its lingual requirements. They all mean exactly the same thing in their time, only the language changes to suit the evolving culture. While the toilet, tends to be a rather sensitive lingual element, one must appreciate how much the rest of a language will evolve over thousands of years.