The history of Islam itself is its own evidence. The very concepts of Dar Al Harb, Dar Al Islam and Koran verse 9:29, which exhorts Muslims to subjugate non-Muslims and force them to pay an inferiority tax, are just some totems to prove it.
In brief, Muhammad was once one of the community leaders in Mecca, who abused his position by trying to convert people to a new religion he'd invented and was banished for it.
Feeling very sore, he took a gang of faithful followers with him and settled in agricultural Medina, where, in the tradition of all good tyrannical cult leaders, he settled his camp and filled out his religion. Unsurprisingly, this is how Islam laid its bedrock of false victimhood and vengeance against the rest of the scornful world.
After building up a personality cult based on divine punishment for disobedience, he and his gang tested their new bloodlust by raiding the caravans of Meccan traders and abusing the occupants. To Muhammad, they were the people giving provision to those who had spurned him, so they had to pay. Well, obviously.
And once Muhammad's vicious thug army was large enough, he went back to Mecca and sacked it in revenge. The religion he had founded, with many peaceful verses to lure in the decent, had proved itself the tool of Muhammad's dictatorship and he gradually took over what is now Saudi Arabia and turned it into a death-worshipping military dictatorship.
When he became the new boss of Mecca he back-wrote the Koran, justifying his bloody coup by writing things like 'slaughter the unbelievers wherever you find them', and using 'abrogation' to cancel out previous peaceful verses which clashed. And as an old man looking back on his life, Muhammad said
"I was made victorious through terror!"
________________
Muhammad, the Jews and usurption of power and control:
Prophet of Doom - Islam and Muhammad
No wonder Hitler's book Mein Kampf is only outsold by the Koran in some parts of the Muslim world!
Even the Muslims recognise Islam as a war creed, though they try and find ways to dodge saying it means war in all cases (which it does):
Jihad: The Holy War of Islam and Its Legitimacy in The Quran
Muhammad so hated women that one female community leader was pulled apart between two camels:
Terrorism and brutality in Muhammad?s thoughts and actions
Not much that can be done. You either force a reform of Islam and get the joint jumping even more than it is or leave them alone, which has seen terror mosques and madrassahs exposed on television and 'community leaders' threaten riots if not bought off with 'development grants' and the like.
Islam is founded on unreconstituted supremacy and dictatorship. You can't order them to reform Islam as Westerners did with Christianity because that would tear up the religion itself.
