It had faded in Europe where exhausted rocky topsoil made farming of any sort more a subsistence deal, and made a come back with colonization of the Americas which opened vast swaths of rich soil and mild climes for unprofitable farming but lacked in people to do the labor, let alone a massive serf class to exploit. That the slave trade coincided with Portugal making inroads into Africa wasn't exactly coincidental, and the numbers that were sent to Europe were a smaller fraction.
But yes, while Chistianity allowed and excused it, it also provided the roots of the later turning against the practice of slavery.