There's never been such thing because any attempt of an Arab secular movement energising have been quashed by the West, choosing to empower extremist elements instead to antagonise any attempts at nationalisation and autonomy.
And no it doesn't take a brutal dictator to enforce harmony between religions. Iraq's democratic government for example, albeit sectarian, has not been oppressive towards Christians. Majority of Syrians support a secular state and reject the FSA's sectarian mantra - without or without Assad. Christians are in power sharing agreements with Muslim parties in the Lebanese parliament. Thousands of Muslims in Iraq held rallies for the Christians suffering under ISIS as well as in other parts of the world - I went to one in London last weekend.
Israel isn't a liberal democracy either.