Paul treats this rather extensively in Romans 6, 7, and 8, as well as 1 Corinthians (7:21; 10:29); 2 Corinthians 3:17; Galatians 2:4; Galatians 4:7; Galatians 4:20; Galatians 5; and then there’s James 1:25; James 2:12; 1 Peter 2:16.
The upshot is, the Church is given the "power to bind and loose," the "keys" (which symbolize the full authority of the king's appointed official, as it made very clear in Isaiah 22:22 and Rev 3:7.) As individual Christians, we have huge liberty to honor God and the persons, places, and things associated with God, on many occasions and in many ways not commanded in a sacred text.
I was reminded of this forcefully a few weeks ago, when I attended the funeral of a veteran over here at the VA who had no family to attend the services: so a group of us VA volunteers attended out of respect. How are these things strictly "Scriptural":
•Holding church burial services at all (find me that in the Bible)
•Putting up tombstones
•Wearing a uniform; being buried in a uniform; having a flag on your casket. •Putting images of crosses, or angels, or flowers, or flags, or any other element of visual or sculptural art at cemeteries
•Putting wreaths at a monument to the dead (e.g. the Tomb of the Unknown Soldier)
•Elaborate ceremonies involving the National Flag for fallen members of the Armed Forces
Moving beyond the theme of non-Biblically-mandated funeral customs, which all of us observe,I'll go on to other examples which show that we ALL do things year-in and year-out not mandated in Scriptures:
•calling a person by a title like "Reverend" or "Doctor" or "Pastor"
•making statues and monuments of people we admire (e.g. George Washington), whose life-scenes and battle-scenes become places of public pilgrimage
•pictures of Jesus Christ, as well as God the Father and God the Holy Spirit, in illustrated Bibles and religious books. Who authorized these illustrations??
•parades and pageants and processions or all sorts
•brides with wedding rings,
•wearing white, carrying bouquets and
•Wedding ceremonies themselves, which were not commanded, commended, not even mentioned in Scripture.
We are at liberty to do all these things, because everything in life, including everything "religious", doesn't have to be authorized by a "verse".
Some day, the scales will be lifted from his eyes, and we will have another convert to the One True Holy Catholic and Apostolic Church.