Imranshaykh,
The same sorts of arguements that you are presenting can be used to claim that Muhammud's connection to prophecy is false also. Some things would be different of course but basically it would be the same arguements. This also applies to Jesus' claim to being the Messiah.
The bottom line is that The Bab carried markings of a prophet enough to create a new religion out of Islam thus reforming and redeeming Islam. This religion grew into the Baha'i Faith which is now a well established world religion. Wether you choose to believe it or not for all practical and spiritual purposes there is a prophet after Muhammud.
Did (Does) Islam need to be reformed? Of course it does. They are so divided amongst themselves that they cannot police their own ranks. The only time they are united is when they fight with the rest of the world.
The Islamic world united in sustained vocal and violent condemnation of a few cartoons. Yet when thousands of people died in the World Trade Centers you heard only a few brief whispers about how it might have been wrong and this was drowned out by boisterous celebration.
Will Islam reform itself? Yes, it will have to or the violence it beggets will bring the wrath of the rest of the world. The war in Iran is little league compared to what the world is capable of.
Right now the Baha'is of Islamic states are persecuted and discriminated against. Mind you know persons are coming to their rescue but if Islam continues to incure the wrath of the world the titanium jet fighters and unmanned drones will do the work of angels for the Baha'i and the work of demons to others.
There is a saying "He who lives by the sword shall die by the sword." I think this probably extends to religion also. The religion that prosteletyze by the sword shall reform by the bullet and the bomb. When Muslim armies put people to the sword and said accept Islam and the prophet Muhammud or die people converted. It worked like a charm. The day is soon coming when the world will say reform and condemn this violence or be annihilated. I bet that works like charm too.
In short; Why waste your time on silly oneway arguments? Why not just reform now by accepting the Baha'i religion. It really could save a lot of families not to mention villages and cities