Dear sandeep, I am surprised that u don;t know anything abt islam. Islam never teach us to kill innocent people...if islam realy permit us to kill Kuffar(non-muslim) than in Gulf country there would not be any Non-muslim, and this is the fact that in gulf so many non-muslims r staying for more than 10 or 20 years, and they r still alive. So it will be better for u to study Islam...before criticing.
And those who r doing sucide bombaing and all that...they don't have any religion..is they r realy a muslim...than they would not have done that.