Some Christians flit in and out of church, from church to church, from pleasure to pleasure, from relationship to relationship, from job to job.
What does from pleasure to pleasure mean?
I think it could mean just about anything, since there are a lot of possible pleasures out there - but that's the point. The people being described are going from one pleasurable activity (eating ice-cream, watching violent movies, staying in bed until eleven in the morning, who knows?) to the next, and the implication is that they are doing this without a thought for the consequences, and the speaker believes this to be a negative thing.