There were heretics in the Galatia/Phrygia region of Colossae that were teaching a mixture of Christianity with Judaism, Mysticism, and Asceticism. They were teaching the Jewish commandments and ceremonies are to still be practiced as works. They were teaching Mysticism in the worship of angelic hosts and other spiritual beings in addition to Christ. Lastly, they were teaching Asceticism, teaching people to live legalistic, judgmental, disciplined lives by the words of man to be holy, but not God's word. In essence, they had three things working against them: False works, false worship, and false words.
How do we know this? Paul tells us in Colossians 2:11-23. This has made me think about how deceiving Satan, the 'father of all lies' is in his nature (John 8:44). He is truly out to kill, steal, and destroy souls (John 10:10). He deceives a few so a few can deceive many. He mixes truth with lies. This is has been going on throughout the ages of history and is predominately seen in North America with the false religions and cults of Mormonism, Jehovah Witnesses, Roman Catholic Church, and Scientology to name a few. They all teach works for faith, the worship of other spiritual hosts and beings, and have explicit disciplinary and legalistic rules and words of religion that were instituted by man, not God in the Bible. All these religions mix Christianity with their religion.
We need to live and tell people the truth as the Apostle Paul did 2000 years ago to the Colossians!
"As the truth is in Christ Jesus." Ephesians 4:21