I agreed there are only examples of burial of the death in both the Old Testament and the New Testament.

1) The Bible recorded mainly recorded the biblical characters that are part of God redemptive plans. Most of them are wealthy. So, they can afford burial.

2) They had more lands outside of the cities than today. Dead people can be buried outside of the cities as a "mass burial" (famine, wars, diseases).

3) The Old Testament recorded "tossing children" into the fire as part of Idol worship.
Today, cremation is NOT "worshipping" the false God.

The basic treatment of the "deceased" body.
1) burial - takes few weeks for the body to be decomposed (rotten).
2) cremation - "purify" the dead body in less than 2 hours.
The person will not feel the "burn" sensation after deceased.

(The question is whether I want my body rotten in few weeks or purified in 2 hours).

Biblical implications:
1) The "soul" leaves the body (the corruptible body)
2) Resurrection - all believers are promised of the "glorified body".

A Christian burial (whether it is burial or cremation) is how the funeral service conducted with biblical reading, singing, and a brief encouraging words from the bible or Christian testimony of the deceased person.

To say: Christian burial must be "burial" is a "spiritual abuse" which God condemned.
There is no biblical instruction or implication that cremation is a sin or God forbidden cremation.
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I am a LCMS member who studied this burial/cremation topic from biblical and cultural perspectives.