Nonsense.
Mohammed is well documented as a merchant, and had no fighting history.
When he converted to Judaism, the Meccans attacked him and forced him to flee to Medina, where he was defended by the 12 Jewish tribes there.
It as the Jewish tribes who did his fighting and defeated the Meccans, converting all of the Arabian Peninsula to Islam.
Allah is just the translation of the word 'god' into Arabic.
It is not a name.
Democracy is system of government based on voting, and Islam is a set of ethical principles, so they have nothing at all to do with each other.
The closest they come to interacting is that Islam supports some social services, like for widows and orphans.