Nominal Christendom cannot see God's law even though it is in plain sight. In Colossians, Paul reiterates or alludes to all but one of the Ten Commandments.
Colossae and Laodicea were susceptible to fast-talking teachers, whose plausible words eroded the true Gospel in favor of pagan thought and practice.
The Laodiceans fail to reciprocate Christ's love for them. The comfort of prosperity blinded them to their spiritual condition, especially their need for Christ.
High Christology as a doctrinal stance was not enough to prevent the eventual apostasy of those in Asia Minor. Doctrine must produce the right conduct.