There certainly are intolerant Islamic groups today, but to describe Islam as a religion as 'intolerant of other religions' is pretty ignorant. Perhaps you could word your question in a less offensive and more nuanced way, so that we can understand exactly what you are getting at?

Edit: changed 'are certainly' to 'certainly are'

In Islam, the word Khawarij means Outsiders. This basically means those who are outside mainstream Islam, in a bad way. For example, ISIS is considered Khawarij, Al Qaeda is considered Khawarij, etc. This term has been in existence since the seventh century, and the first group of Khawarij was the Original Kharijites.

These Kharjites first assassinated Uthman ibn Affan, the third Calpih of the Rashidun Caliphate (the first Caliphate after the death of Muhammad). ISIS recently released a document saying that they are targeting to kill 20~ Islamic scholars of the west and called them Kafir (Disbelievers).

His assassination started the First Fitna or the First Islamic Civil War. During this time, nationalism was growing. People were from the former Sasanian Empire and Byzantine Empire were wanting to base the Islamic Caliphate off their lands and such. So the Syrian governor, Muawiyah I, and his supporters killed Uthman ibn Affan. Before Uthman was killed, the Kharijites supported Ali. When Ali came into power, the Kharijites and Muawiyah I went into war with the other Muslims. Eventually Muawiyah and the Kharijites won, which overthrew the Rahisdun caliphate and established the Umayyad Caliphate.

Now I'll quote some Hadith which talks about the future Kharijite.

Yusair bin Amr reported

I asked Sahl bin Hunaif, "Did you hear the Prophet saying anything about Al-Khawarij?" He said, "I heard him saying while pointing his hand towards Iraq. "There will appear in it (i.e, Iraq) some people who will recite the Quran but it will not go beyond their throats, and they will go out from (leave) Islam as an arrow darts through the game's body.' "

Abu Sa’eed Al-Khudri reported

There will come a people from the east who recite the Quran but it will not go beyond their throats. They will pass through the religion just as an arrow pierces its target and they will not return to it just as the arrow does not return to the bow.

Abu Dharr reported

Allah's Messenger (saws) said: Verily there would arise from my Ummah after me a group (of people) who would recite the Quran, but it would not go beyond their throats, and they would pass clean through their religion just as the arrow passes through the prey, and they would never come back to it. They would be the worst among the creation and the creatures.

In all these Hadith, the Khawarij are known to be Muslims by name and will say they have read the Quran but have no idea what it means. This can be said about ISIS. They have cited Quranic verses and said that these are verses commanding them to kill non Muslims and Muslims alike. In reality, these verses are about certain historical times, like different battles Muhammad fought in. They are also known as bad people.