Nonsense. Slavery long predated Islam and for that matter Christianity. The slave trade was one of the main economic props of the Carthaginian economy.
spread slavery to the Americas
Double nonsense. Muslims had little to do with the trans-Atlantic trade, at least directly. This is because various powerful African coastal nations prevented the Muslim traders from directly contacting the Europeans. Of course, some of the slaves sold were probably originally captured by Muslims, then resold to the pagan coastal middlemen.
were the last to give it up
Pretty much true.
and are the only culture on earth still practicing it.
Not entirely true. Various African (non-Muslim) groups still practice it. And if you classify the various "human trafficking" practices as slavery it is widespread, including in this country. Just not legally.
Slavery vanished from Europe with the fall of the Western Roman Empire and was reintroduced by Muslim traders a millennium later.
Nope. Slavery existed throughout the Middle Ages, it just wasn't dominant, being replaced in most of Europe by serfdom.
The term "slave" itself comes from Slav. "This sense development arose in the consequence of the wars waged by Otto the Great and his successors against the Slavs, a great number of whom they took captive and sold into slavery. [Klein]"
I don't think any of us are trying to argue that Islam originated slavery, not are we trying to argue about the etomological origins of the word slave.
All of us understand that the practice is as old as human civilization itself.
We're simply stating that modern African slavery has Islamic origins.
Up until the last round of Islamic expansion was smacked down at the gates of Vienna and the battle of Lepanto in the mid 17th century, Europeans were also captured and sold into slavery by the Religion of Peace. The biographical account of one such slave, a distant cousin in my family tree, appears here.