Slavery is placed next to other wicked acts (and conversely, helping to free slaves is seen as the morally upright high road) across plenty of texts. It's more productive to condemn those who selectively live their faith in the ways that most convenience them and harm others, rather than making blanket attacks on faith or religion in general.

> And he that stealeth a man, and selleth him, or if he be found in his hand, he shall surely be put to death.

> Neither have I suffered that ye should be confined in dungeons, nor that ye should make slaves one of another, nor that ye should murder, or plunder, or steal, or commit adultery; nor even have I suffered that ye should commit any manner of wickedness, and have taught you that ye should keep the commandments of the Lord, in all things which he hath commanded you

> Righteousness is not that you turn your faces toward the east or the west, but [true] righteousness is [in] one who believes in Allah, the Last Day, the angels, the Book, and the prophets and gives wealth, in spite of love for it, to relatives, orphans, the needy, the traveler, those who ask [for help], and for freeing slaves

Chattel slavery is a particular kind of slavery that is especially egregious. One who is interested in the topic will find that there are many kinds of slavery, and that it exists on a spectrum.