How Serious Is the Use of Instrumental Music in Christian Worship?

(1) Instrumental Music is not allowed or authorized to use as per the New Testament doctrine. (2) Those who use instrumental music [but in] every thing else [worship] as per New Testamemt doctrine [where] will they go to [in] eternity? (3) Is that a Great Sin that a person can not [go into] eternity [with God]? ~ Joe David, Chennai, India

It is accurate that the use of instrumental music in Christian worship is not authorized in the New Testament. Instead, vocal music, namely singing, is authorized in the New Testament for Christian worship (Ephesians 5:19; Colossians 3:16). Therefore, to do something that is not authorized in worship of Almighty God, in direct opposition to what is authorized in worship of Almighty God today is sinful (Leviticus 10:1-2). The apostle Paul wrote that there is a penalty for sin of spiritual death (Romans 6:23). Sin has always separated between God and mankind (Isaiah 59:1-2). Any sin, irrespective of what sin that might be, if not repented of, has the capacity of condemning a soul to hell (Revelation 21:8).