"What miniscule fraction write screeds and take up arms"
Approximately 10%. But that's not the reason I say Islam is a fake. The reason I say Islam is a fake is because as a theology, it can be used to justify everything from Sufi to ISIS and everything in between. There is no coherent morality to Islam, because Allah himself, as portrayed in the Koran, is not a faithful God, is not coherent from verse to verse.
A similar problem can be found in the Old Testament, and has inspired an awful lot of fundamentalism and atheism in Christianity and Judaism, perhaps the extreme example that can be found in our time, and a close cousin to the violence of ISIS, is Zionism in Israel.
"Catholicism has the bloody destruction and enslavement of the Americas on it's conquistador hands."
"Islam - past and present - has nothing to shade that, by way of comparison."
Have you paid attention to what has been happening in Africa in the last 150 years?
"The "muslims" that you see and read about with violent conversion and conquest? They are created, inflated and supplied by the various trans-national agencies and alliances in Global para-politics."
They've been in existence far longer- the Sunni/Shi'a split happened within a generation of the death of the Prophet.