“Give back to Caesar what belongs to Caesar, and to God what belongs to God.” (Matthew 22:21)
Caesar represents earthly powers and governments. Christ says that we must recognize the rights of earthly powers and governments. Scripture teaches that God installs governments. All power comes from God. (Cf Romans 13: 1). We are not only to obey them but we are urged to pray for them. (Cf 1 Timothy 2: 1 - 2).
What belongs to Caesar?
Work: Monday to Saturday.
taxes, civil obedience, etc.
We offer to God what is properly His. This includes:
Obedience, Worship, Prayer, Love.
Is there a conflict? When Caesar wants what belongs to God, the Christian must say no. We must obey God rather than man, St. Peter said. (Acts 5: 29). Jesus Christ foreseeing the conflict urges his follower not to fear the person who can destroy the body and can do nothing more. The person to fear is God, who can destroy body and soul in hell. (Matthew 10: 28).
The martyrs of the Church never tried to deprive Caesar of what belongs to him. It was always Caesar who keeps what belongs to him and wants to deprive the creator of what belongs to Him.
Consider something that belongs to God that is very dear to His Heart.
"Remember the Sabbath day by keeping it holy." (Exodus 20: 28).
This is what the Church teaches on keeping holy the Lord's Day.
"On Sundays and other holy days of obligation, the faithful are to refrain from engaging in work or activities that hinder the worship owed to God, the joy proper to the Lord's Day, the performance of the works of mercy, and the appropriate relaxation of mind and body. Family needs or important social service can legitimately excuse from the obligation of Sunday rest. The faithful should see to it that legitimate excuses do not lead to habits prejudicial to religion, family life, and health.
The charity of truth seeks holy leisure - the necessity of charity accepts just work." (CCC 2185).