That includes Muslims who don't toe the line. And it contradicts the Constitution of Medina:
Significance of the Ummah
Another important feature of the Constitution of Medina is the redefinition of ties between Muslims. The Constitution of Medina sets faith relationships above blood-ties and emphasizes individual responsibility.[29] Tribal identities are still important, and are used to refer to different groups, but the "main binding tie" for the newly created ummah is religion.[30] This contrasts with the norms of pre-Islamic Arabia, which was a thoroughly tribal society, although Serjeant postulates the existence of earlier theocratic communities.[31]*
According to Denny, “Watt has likened the Ummah as it is described in the document to a tribe, but with the important difference that it was to be based on religion and not on kinship”.[30] This is an important event in the development of the small group of Muslims in Medina to the larger Muslim community and empire.[32]
Rights of non-Muslims
The non-Muslims included in the ummah had the following rights:[33]
1. The security of God is equal for all groups,[34]
2. Non-Muslim members will have the same political and cultural rights as Muslims. They will have autonomy and freedom of religion.[35]
3. Non-Muslims will take up arms against the enemy of the Ummah and share the cost of war. There is to be no treachery between the two.[36]
4. Non-Muslims will not be obliged to take part in religious wars of the Muslims. **[37]
https://en.wikipedia.org/w/index.php?title=Constitution_of_Medina&printable=yes
*The Saudis appear to have violated that, and they possess Mecca.
**ISIS has broken each and every one of those rules.
Their medieval mindset in a more crowded world is a very bad idea. But it's won out before, causing a lot of devastation. And it's very hard to resist since the world is as interconnected as it is.
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