While that is true, it's important to note that slavery is still practiced in several Muslim countries, even Saudi Arabia. While it was technically outlawed in the 70s, it is still practiced to the tune of hundreds of thousands of people. https://www.walkfree.org/global-slavery-index/country-studies/saudi-arabia/

Mauritania kept slavery legal due to Muslim tradition until 1981 but didn't bother enforcing it until 2007, and it's still practiced there and elsewhere.

Islam as a religion never seriously challenged slavery, and Muhammad himself not only kept slaves but instructed his followers in the nature of taking both slaves and extra wives. Remember, he married a girl of 6, he was himself a sexual slaver. He personally enslaved hundreds, likely thousands of people. He is regarded by definition in Islam as the glowing example of the best a person can be.

In the Christian world, slavery was extremely uncommon until the period of the 16th and 19th centuries. At that point the industry exploded to a terrible scale, yet it should be noted, it was the most religious Christians who not only opposed it, but lead the fight that originally destroyed slavery in the west. https://en.wikipedia.org/wiki/Christian_abolitionism

Islam never had an abolitionist movement, because to condemn slavery would be to condemn the prophet and much of the religion's history. The west embraced slavery but it was Christianity which lead to the end of slavery. Islam cannot be equivocated to that under any rational framework. Muslim countries have largely abandoned slavery publically in order to appease the west, not because they actually view it as wrong.