Well, I will not comment on that, anyway, there are different versions of Islam prevalent today: Wahabism, Deobandi,...etc.
There are different sects in Islam: Sunni, Shia, Ahmedia, ...etc.
So, if there is only one version of Islam which is correct then the others must be wrong. Now, each one claims the other is unislamic. So, who is the right Islam? Who decides?
Also, another angle here: TTP is asking for Sharia in Swat(and then in rest of Pakistan). Pakistan claims that it is an Islamic republic, then why is Pakistan(PA) not implementing Sharia? Does Pakistan(PA) think that Sharia is out-dated?
There are several questions that arise from your assertion. If a satisfied answer is not found(which has not been found as yet), then one can only say that we have to disagree with your claim about your religion which, perhaps, stems from your deep respect for it and nothing more.