The major impediment to a richer sacramental life still seems to be the reluctance to see sacraments as present acts of God rather than merely human memories of God’s acts in the past. It is difficult for many Protestants to conceive of sacraments as God’s self-giving. Little sense of sacramental efficacy survives among many Protestants and, for that matter, among not a few Roman Catholics. For many, the Enlightenment decisively severed any connection between the spiritual and the physical.
The Sacraments in Protestant Practice and Faith by James F. White, 140-141.