I'm no expert, but doesn't the Ba'hai faith more or less believe that God sent different messages/messengers to different parts of the world? While humans persecute each other over religion and race to proselytize, maybe God accepts sincere belief regardless of the particular dogma.
I don't know. Maybe someday I will. Maybe not. That's why it's called the Grand Secret.
No. If that were the case, the character of the god would be the same and not dependent upon the messenger. His 'way' would be the same... And what would be the point of sending forth agents with differing messages? That is confusion.
Yahweh has sent out ONE message - incredibly and incrementally consistent in itself - to all the world, and to all the ages. He made sure his message could not be changed - Nothing changes Torah, and no prophet can gainsay what a previous prophet has said (to include Moses and Yeshua).
The word of this god (YHWH) cannot be altered, unlike the muslim god, and every other god on the planet, whose agents are authorized to change what was said before, in order, presumably, to change with previously unknown events occurring to go along with the times - Thus the value of YHWH's declaration, that only he knows the end from the beginning, speaking in ancient times what would be in the end. Thus the truth that YHWH does not change. That is an amazing and remarkable proof.
That is a signature of character that would shine forth regardless of the agent bringing the message. That is a message with a purpose different from all the others.
However, it is also instructive to do the same with the other gods... You will soon find familiarity in comparative religion, as the character of the false gods, the Fallen, become apparent. Their characters shine through, just as much - But not in a good way.
The Muslim god is not YHWH, regardless of what they believe and what he speaks through his agents. In fact, he is diametrically opposed to the one God YHWH, in every thing. His prophecies are the exact opposite of what YHWH has declared.
Arguments such as yours are made by people ignorant of the structural nature of the prophets. And of the Word. Be careful who you listen to - Much better to find out for yourself.