Whatever takes the place of God in your life is a false altar. Do you pretend to be worshiping God and yet you find it comfortable to tell lies, get involved in fornication and adultery? Do you have sinful friends you still relate with, comfortably? Is there anything that still pushes you to sin? These are false altars.
And when the men of the city arose early in the morning, behold, the altar of Baal was cast down, and the grove was cut down that was by it, and the second bullock was offered upon the altar that was built. (Judges 6:28|KJV)
It is always difficult to handle them with human strength. Seek the assistance of a matured child of God or pastor; let him or her help you. You will find strength in Jesus’ name to pull down those altars.