"Came to an end? What are you talking about."
Well, I listed widespread religious oppression over doctrinal disputes, high taxes, debt peonage/slavery, and constant pointless warfare with the Persians. Are you denying that:
1) Byzantine Diophysites no longer oppressed and slaughtered Monophysites in lands under the suzerainty of the Caliphate
2) The jizya was lower than the battery of taxes the Byzantines inflicted on their subjects
3) Conversion to Islam was a quick and easy ticket out of slavery and debt peonage for non-Muslims
4) After the Muslims conquered the Levant and Persia, there were no more wars Levantines were expected to fight against Persians
?
"the "light hand of the Umayyads" resulted in internal revolts which paved the way for the Abbasids to take over."
Internal revolts by other Muslims and recent converts to Islam brought about the end of the Umayyads, not the "oppressed" non-Muslims. The Umayyads were wiped out in a palace massacre, and the two armies that had decided the issue before that were both Muslim ones.
"As for taxes, I suppose we'll pretend the djizya made the "liberated" Christians feel all happy inside. "
Are you seriously suggesting that Christians paid no taxes under the Romans? The jizya brought in far less revenue than the older taxes levied by Constantinople, and the Christian communities were free to raise the money among themselves as a community in any way they saw fit. Funny that you go on about a "social contract" and the responsibility for all proles to pay taxes, but then complain that a tax is absolute proof of religious oppression.
"The Muslim invaders forced human tribute/annual quotas of slaves on conquered populations (which were written into the treaties)"
The devshirme was an Ottoman system, not an Umayyad one. And it was quadrennial, not annual.
As for slavery, yes there was slavery in the Islamic world, but it was completely unlike the chattel slavery seen in the "civilized" world. Slaves were allowed to own property and as often as not bought their own freedom in the Islamic world. They also rose to great heights in government - the 'slaves' taking over was such a common occurrence in Islamic civilization as to be a cliche.
"I don't get your anti-Americanism, since America has been a boon to your Muslim friends everywhere it goes. Secular Iraq, replaced by Islamist Iraq. Secular Libya, replaced by Islamist Libya. Secular Egypt, replaced by Islamist Egypt..."
But more importantly than whether or not the dictators in all these nations pray five times a day or not, the power and influence of the US and its corporations has greatly expanded. The Iraqi military went from using Soviet equipment to using American equipment - at big expense for Iraq and profit for General Dynamics et al. I'm sure Iraq's oil exploration and extraction contracts are all firmly in the hands of American (or American-aligned) corporations and the threat of Iraqi oil being sold in Euros is dead. Whatever oil revenues Iraq is being allowed to keep are almost certainly being spend on American weapons, mercenaries, and Wall Street investments. I'm sure the story is more or less the same in every other country. The "Secular to Islamist" story is all window dressing intended for public consumption by a public that knows only that Muslims are strange and other-y. It's all a titillating cover story to keep everyone distracted with (mostly fake or exaggerated) stories of eeevil Muslim religious fanaticism while the real power in these countries is being consolidated and wealth extracted into western hands (or at least the hands of satraps loyal to America). Much like the media keeps us all distracted with arguments over whether the top tax bracket should be 39% or 35% while completely ignoring all the loopholes and deductions that allow the truly rich to weasel out of paying any taxes at all.