Are there any Arab democracies? Hussein in Iraq and Gaddaffi in Lebanon were dictators.

The Libyan regime was not a dictatorship of any sort. Nothing like Trump's America, anyway.

Under them there was an apparancy of comparable peace.

Also, for women, a great deal more freedom, welfare and opportunity than most other regimes in the area. But half the human race doesn't count for the Western propaganda machine.

Am I right in assuming that the main cause of the civil wars that followed the dictator's removals is the conflict between different versions of Islam?

No. The main cause has been the West's war against (1) Middle Eastern secularism and (2) Shia Islam, for the last generation. They don't have a problem with Sunni fundamentalists because Sunni fundies don't have a problem with neo-feudal oligarchy, which is what the US corporations like to deal with. Hence the current genocidal war in Yemen, where the Western and Saudi-backed Sunni government is starving most of its own (mostly Shia) population to hang on to power. This looks like being much more lethal than anything Assad has done, but any cruise missiles America fires are going to be aimed at the Shia majority.

I don't see Trump (or anybody in the liberal part of the American political establishment, either) having any problem with the Shia/Sufi majority facing indiscriminate massacre in Pakistan.

The divide between Shias and Sunnis does go back 1300 years, but it has only become an ideological rationale for all-out mass murder because of American business interests since the 1970s.