Question
Can a Christian be a secular musician as a profession?
Answer
The New Testament command is to labor in order to provide for our material needs and those of others (Ephesians 4:28; 2 Thessalonians 3:10). No particular kind of labor is specified, so it is completely generic as long as it is legal (Romans 13:1) and moral (Ephesians 5:11). Many musical careers involve immorality, such as playing in bars, or false religion, such as playing for a church worship service. Obviously these are wrong (Ephesians 5:11).
Question
If so a christian opted to sing gospel song, will he/she be violating the commandment on non-instrumental music if he/she chooses to using musical instrument in his/her choosing career outside the worship?
Answer
Worship in song can be in the worship assembly of the church (1 Corinthians 14:15-19), in a group outside the worship assembly (Acts 16:25), or completely individual (James 5:13). Regardless, the only kind of music the Lord has authorized is vocal, singing (Acts 16:25; Romans 15:9; 1 Corinthians 14:15; Ephesians 5:18-19; Colossians 3:16; Hebrews 2:11-12; James 5:13).
Question
When are we in worship? Does what we do in our career part of worship?
Answer
Our careers should be part of our service to God (Romans 12:1-2; 1 Corinthians 10:31), but worship is that part of our lives where we act for the purpose of showing our love and reverence for God (cf. Genesis 22:5; Psalm 95:6).