We need to produce an effective antibody to destroy this Islamic organism!
On a more serious note:
Ive seen these figures before, but they all suggest islam generates through mostly birth.
Agreed. Though you could say its slowing down in the western hemisphere recently, with the newer generation following western society over cultural preferences (in terms of birth rates).
im also curious about how islam intends to develop as an organisation if so many muslims disagree with each other
I think this is particularly true for the Arabian Peninsula where in some cases one of the muslim group is treated as an inferior over others (Sunni vs Shia). Not to mention the other sub-sections of Islamic belief (Hanafi, Maliki, ect...) could potentially weaken its grip over time.
alluding that the organisation is crumbling form the inside.
It'll be a long time till we see any significant damage to the numbers.