It is Islam, without any question.
Other religions do not really count anymore, because their atrocities lay way back in the past. I will not undestimate the fundamental christians especially in the US (we do not really have this phenomenon in Europe), but even they will not just kill you if you disrespect their god and/or prophets.
And: christians, jews, hindus and buddhists have a theology, kind of philosophical blabla to construct justifications for their particular believe system.
Islam does not have that. There is nothing to be interpreted or transformed into modern times to convince others. There is just the direct word of allah and his prophet. There is no philosophical discourse about the faith as such, the only thing the scholars develop are different views on the hadith and the subsequent sharia, the punishment sytem. As: should you stone a 10 year old girl to death because she was not praying properly or should you wait until she's 15.
And, of course, their world conquering program.
Recep Tayyip Erdogan, the President of Turkey to the turks in Germany: " The minarets are our bajonets, the mosques our barracks, the domes of the mosques our helmets and the wombs of our women our army.".
So the problem is not a philosophical debate about the nonsense of religion itself, or some gradual differences between them.
We have to face the bitter reality that we are confronted with a crowd of 1,2 billion mentally retarded medieval crackheads trying to take over the planet.