The Lord desires that we worship "in spirit and in truth" (John 4:23-24). It makes sense to seek God's will on how we should worship, as such is an expression of our love (John 14:15; 15:14; 1 John 5:3).
Christians are to assemble together for the purpose of worshiping and provoking one another to good works (Hebrews 10:24-25). Our services consist of the following:
The worship assembly is to be done decently and in order (1 Corinthians 14:40). Even though the miraculous gifts have ceased (1 Corinthians 13:9-10), we can observe from 1 Corinthians 14 that the priorities are worshiping God and edifying one another (1 Corinthians 14:25-26). As such, we teach all the Bible—the comforting words as well as the rebukes. You will not see robes, incense, or other ritualistic paraphernalia in our worship. Neither will you see choirs, bands, or other artifices of entertainment.
Although the covenant has changed, the Old Testament provides insight and context (Romans 15:4). God did not accept the worship of Nadab and Abihu (Leviticus 10:1-3). Neither did he accept the sacrifices of King Saul (1 Samuel 15:22-23). The unauthorized worship of King Uzziah was likewise rejected (2 Chronicles 26:15-20). All these men attempted to worship God in their own way and were punished severely for their deviations. Jesus condemned vain worship (Mark 7:7). Accepting Jesus as Lord and doing good deeds means nothing if one does not seek God's will (Matthew 7:21-23).